o I
o I O pref.
O I Ocean
O-level ordinary level
O. I observer
O. K. coll.
O.C. Officer Commanding
O.D. I Officer of the Day
O.E.D. Oxford English Dictionary
O.H.M.S. on His (Her) Majestys Service
O.K. okay
O.P. I observation post
O.S. ordinary seaman
O.T. Old Testament
O.U. Oxford University
o/a on account
O/D on demand
O/R on request
O/S I on sale
OAAPS Organization for Afro-Asian Peoples Solidarity
oaf
oafish
oak
oak-apple
oak-tree = oak
oak-wood
oaken
oakery
Oakland
oaklet
oakum
oaky
OAP old age pensioner
oar
oarage
oared
oarsman
oarsmanship
OAS Organization of American States
oasis
oast
oast-house
oat
oat-flakes
oatcake
oaten
oath
oath of allegiance
oath of office
oath-breaker
oath-breaking
oatmeal
oats
OAU Organization for African Unity
Ob
obduracy
obdurate
obedience
obedient
obedientiary
obeisance
obelisk
obelize
obelus
obese
obesity
obey
obey the law
obey the rule
obfuscate
obi jap.
obiter dictum
obiter lat.
obituarist
obituary
obituary notice
obj. objective
object I
object-finder
object-glass
object-lesson
objectify
objection
objectionable
objective
objective case
objective method
objective table
objectivism
objectivity
objectless
objector
objurgate
objurgation
objurgatory
obl. oblong
oblate
oblation
oblational
obligate
obligation
obligatory
oblige
obligee
obliging
obligingly
obligor
oblique
oblique case
oblique fire mil.
oblique narration
oblique oration
oblique photography
oblique speech
obliquity
obliterate
obliteration
oblivion
oblivious
oblong
obloquy
obnoxious
oboe it.
oboist
obs. I observation
obscene
obscenity
obscurant
obscurantism
obscurantist
obscuration
obscure
obscurity
obsecration
obsequial
obsequies
obsequious
obsequiousness
observable
observance
observant
observation
observation balloon
observation car
observation point mil.
observation satellite mil.
observation station mil.
observational
observatory
observe
observe good manners
observe silence
observe the time
observed
observer
obsess
obsession
obsessional
obsidian
obsolescense
obsolescent
obsolete
obstacle
obstacle course sport
obstacle races
obstacle-race
obstetric(al)
obstetrician
obstetrics
obstinacy
obstinate
obstipation
obstreperous
obstruct
obstruct the traffic
obstruction
obstructionism
obstructionist
obstructive
obtain
obtain a class
obtainable
obtest
obtestation
obtrude
obtruncate
obtrusion
obtrusive
obturate
obturation
obturator
obtuse
obtuse angle
obverse
obviate
obvious
oc ocean
ocarina
occas. occasionally
occasion
occasional
occasional ode
occasionalism
occasionally
Occident
occidental
occidentalism
occipital
occiput
occlude
occlusion
occult
occulting light
occultism
occultist
occupancy
occupant
occupation
occupation bridge
occupation franchise
occupation road
occupational
occupational deferment
occupational disease
occupational hazards
occupational therapy
occupier
occupy
occur
occurence
OCD Office of Civil Defense
OCDM Office of Civil Defense and Mobilization
ocean
ocean bed
ocean deeps geol.
ocean lane
ocean-going
Oceania
Oceanian
oceanic
oceanography
ocelot
ochlocracy greek
ochre
oclock
OCR Optical Character Recognition
Oct. October
octa- pref.
octagon
octagonal
octahedral
octahedron
octal
octane
octane number
octane value
octant
octarchy
octave
octavo
octennial
octet(te)
octillion
October
octodecimo
octogenarian
octonarian prosody
octopus
octoroon
octosyllabic
octosyllable
octuple
ocular
oculist
OD I olive drab
odalisque
odd
odd card
odd fish
odd hand
odd lad
odd man
odd man out
odd moments
odd money
odd months
odd player
odd volumes
odd-come-short
odd-come-shortly
oddball
oddfellow
oddish
oddity
oddly
oddly enough
oddments
odds
odds and ends
ode
Oder
Odessa
Odette
odeum
ODI Optical Digital Image
Odin
odious
odium
odometer
odontic
odontoid
odontology
odoriferous
odorous poet. see odoriferous
odour
odourless
Odysseus
Odyssey
OE Old English
OECD Ogranization for Economic Co-operation and Development
oecumenical
oecumenical council
oedema
Oedipus
OEEC Organization for European Economic Cooperation
OEO Office of Economic Opportunity
Oeresund
oersted
oesophagus
oestrogen
oestrum
oestrus
of a certain age
of a verity obs.
of base alloy
of current interest
of especial importance
of foreign growth
of foreign manufacture
of good account
of high account
of home manufacture
of humble origin
of late years
of less importance
of malice prepense leg.
of mark
of minor interest
of much account
of necessity
of no account
of no consequence
of no fixed abode leg.
of no importance
of old
OF Old French
of paramount importance
of perforce
of prep.
of ripe age
of set purpose
of small account
of that ilk
of the best brand
of the essence
of the old school
of three dimensions
off
off and on
off colour
off duty
off hand
off limits amer.
off ones dot jargon
off ones head
off ones rocker sl.
off season
off side sport (
off the cuff
off the hinges
off the map
off the point
off the rails
off the reel
off the target
off the track
off-air
off-balance
off-beam
off-beat
off-black
off-centre
off-chance
off-day
off-duty
off-guard
off-hand
off-hand manner
off-hour
off-hour job
off-key
off-licence
off-limits
off-load
off-peak
off-position
off-print
off-putting
off-shore
off-shore procurements amer.
off-shore purchases amer.
off-shore wind
off-stage
off-street
off-street parking
off-the wall coll.
off-the-cuff
off-the-shelf
off-the-shelf items
off-white
off-year
off-year elections
offal
offcast
offence
offend
offender
offensive
offensive defensive mil.
offensive language
offensive return
offensive stroke
offensive war
offer
offer an apology
offer an opinion
offer battle
offer excuses
offer hand
offer hope
offer prayers
offer prospects of
offer resistance
offer to strike
offering
offertory
offhand
offhanded = off-hand
offhandedly
office
office block
Office for the Dead
office hours
Office of Education
office seeker
office studies geol.
office-bearer
office-boy
office-copy
officer
officer of health
officer of the court
official
official circumlocution
official duties
official red tape
official representative
official statement
officialdom
officialese
officialism
officialize
officially
officiant
officiary
officiate
officinal
officious
offing
offish
offreckoning
offscourings
offscreen
offset
offset printing
offshoot
offspring
offspur
oft
oft- pref.
oft-recurring
often
oftentimes
ogee
ogham
ogive
ogle
ogre
ogress
OH Ohio
Ohio
ohm
oho interj.
OIF Office of International Trade
oik
oil
oil and vinegar
oil magnate
oil of birch
oil of cloves
oil of vitriol
oil seal tech.
oil tank truck
oil tanker
oil tar
oil(-)engine
oil-bearing
oil-car
oil-coat
oil-colour
oil-derrick
oil-filler
oil-fired
oil-fuel
oil-gland
oil-hole
oil-painting
oil-paper
oil-press
oil-producing
oil-stained
oil-stone
oil-tanker
oil-well
oilcake
oilcake meal
oilcan
oilcloth
oiled
oiler
oilfield
oilman
oilplant
oilskin
oily
ointment
OJT On the Job Training
Oka
Okie
okie dokey amer. = O. K.
Okinawa
Okla. Oklahoma
Oklahoma
old
old age
Old Bailey
old bat
old bean sl.
old bones joc.
old boy
old buck
old buffer disdain.
old campaigner
old chap
old cock
old family
old fellow
old file rude
Old Gentleman
old girl disdain.
Old Glory amer.
old hand (at smth.)
Old Harry
old hooker disdain.
old lady coll. (
Old Lady of Threadneedle Street
old maid
old mans beard
old masters
Old Nick
Old Norse
old offender
old parliamentary hand
old people
old ship
Old Testament
old thing
old wives tales
Old World
old-age
old-age pension
old-clothesman
old-clothesshop
old-established
old-fashioned
old-gold
old-hat
old-maidish
old-style
old-time
old-timer
old-world
olden
oldie
oldish
oldster
oleaginous
oleander
oleaster
oleograph
oleomargarine
olericulture
oleum
olfactory
olfactory organ
olid
oligarch
oligarchic(al)
oligarchy
olio
olivaceous
olivary
olive
olive oil
olive-branch
olive-tree
olive-wood
Oliver
olivet(te) = olive
Olivia
olympiad
Olympian
Olympian calm
Olympic
Olympic games
Olympic green min.
Olympus
Oman
OMB Office of Management and Budget
ombre
ombrometer
ombudsman
omega
omelet(te)
omen
ominous
omissible
omission
omit
omnibus
omnibus bill
omnibus box theatr.
omnibus edition
omnibus resolution
omnibus train
omnidirectional
omnifarious
omnifarious reading
omniparity
omnipotence
omnipotent
omnipresence
omnipresent
omnirange
omniscience
omniscient
omnium gatherum joc.
omnivorous
omphalocele
omphalos greek
omul
on
on a hunch
on a par
on a war footing
on and off
on average
on board
on business
on call
on comparable terms
on condition
on credit
on deck
on duty
on earth
on hand
on horseback
on land
on leave
on location
on no consideration
on oath
on occasion
ON octane number
on ones deathbed
on ones own account
on ones own responsibility
on order
on paper
on patrol
on penalty of
on private account
on purpose
on purpose to
on repeated occasions
on schedule
on second thoughts
on Shankss mare
on Shankss pony
on sick leave
on the ball amer.
on the bend
on the blink amer.
on the blob sl.
on the chance
on the cheap coll.
on the co-op
on the contrary
on the crook
on the cry
on the decline
on the eve
on the flat paint.
on the gridiron fig.
on the ground of
on the hoof
on the jar
on the job
on the jump
on the lam
on the level
on the line
on the map
on the never-never joc.
on the nose
on the off chance coll.
on the outside
on the pavement
on the phone
on the rocks
on the view
on the wallaby austral.
on the wallaby track austral.
on the way home
on this basis
on this point
on view
on-licence
on-position
on-screen
on-the-spot
on/upon the whole
onager
once
once again
once and again
once bitten twice shy prov.
once in a way
once in a while
once more
once removed
onceover
oncer
oncological
oncology
oncoming
ondatra
one
one and all
one and only
one day
one for smth. coll.
one for the road
one of these days
one or two
one too many
one way or another
one way or the other
one-aloner
one-armed
one-decker
one-eyed
one-figure
one-handed
one-horse
one-idead
one-ideaed
one-legged
one-liner
one-man
one-man business
one-man show
one-of-a-kind
one-off
one-piece
one-sided
one-sided street
one-time
one-to-one
one-track
one-track mind
one-upmanship
one-way
one-way street
onefold
Onega
oneness
oner
onerous
onerous duties
ones best bet
ones bottom dollar
ones early days
ones womankind
ones womenfolk
oneself pron.
onfall
onflow
ONI Office of Naval Intelligence
onion
onion-skin
oniony
onlay
onlooker
only
onomatopoeia greek
onomatopoeic(al)
ONR Office of Naval Research
onrush
onset
onset of wind
onshore
onslaught
onstage
Ont. Ontario
Ontario
onto prep.
ontogenesis
ontogeny
ontology
onus lat.
onward
onward movement
onwards = onward
onyx
oodles
oodles of money
oof
ooh interj.
oolite
oolitic
oology
oolong
oomph
OOP Object Oriented Programming
oops interj. coll.
OOPS Object-Oriented Programming System
ooze
oozy
op
op. I operation
op.cit. opus citatum
opacity
opal
opal glass
opalescent
opaline
opaque
opart
ope poet. see open
OPEC Oil Producing and Exporting Countries
open
open boat
open champion
open circuit
open contempt
open countenance
open day
open field
open ice
open into
open letter
open market
open on
open out
open season
open shop amer.
open sore
open space
open the ball
open up
open verdict leg.
open water
open work
open-air
open-and-shut
open-armed
open-door
open-eared
open-ended
open-eyed
open-faced
open-field system
open-handed
open-hearted
open-minded
open-mouthed
open-necked
open-plan
open-work
opencast
opencast mining
opener
opening
openly
openness
opera
opera-cloak
opera-glass(es)
opera-hat
opera-house
operable
operand
operate
operated
operatic
operatic singer
operating
operating costs
operating knife
operating personnel
operating surgeon
operating table
operating temperature
operating theatre
operating-room
operating-theatre
operation
operation costs
operation testing
operational
operational costs
operational efficiency (
operative
operative condition
operatize
operator
operators position
operetta
Ophelia
ophidian zool.
ophiolatry
ophite
ophthalmia
ophthalmic
ophthalmologist
ophthalmology
opiate
opine
opinion
opinion giver
opinion makers
opinion poll
opinionated
opium
opium den
opium-eater
OPM Office of Personnel Management
opodeldoc
opossum
opp. opposite
oppidan
opponent
opportune
opportune moment
opportune rain
opportunism
opportunist
opportunistic
opportunity
oppose
opposed
opposed landing naut.
opposite
opposite poles electr.
opposition
oppositionist
oppress
oppression
oppressive
oppressive domination
oppressive legislation
oppressiveness
oppressor
opprobrious
opprobrious language
opprobrium
oppugn
opt
opt out
opt. I optician
optative gram.
optic
optical
optical disc tech.
optical illusion
optician
optics
optimism
optimist
optimistic(al)
optimize
optimum
option
optional
optophone
opulence
opulent
opulent vegetation
opus lat.
opus magnum
opuscule
or I cj.
OR I owners risk
orach
oracle
oracular
oral
orally
orang-outang
orang-utan
orange book
orange I Orange
orange lily bot.
orange lodge
orange melon bot.
Orange River
orange-blossom
orange-fin
orange-peel
orange-tip
orangeade
Orangeman
orangery
oranges and lemons
orangey
orate
oration
orator
oratorical
oratorio
oratory I
orb
orbed
orbicular
orbicular muscle anat.
orbit
orbital
orbital station
orbital transfer
orbiting
Orcadian
orchard
orcharding
orchardman
orchestic
orchestics
orchestra
orchestral
orchestrate
orchestration
orchestrion
orchid
orchidaceous
orchil
orchis
ord. I order
ordain
ordeal
order
order about
Order in Council
order nisi
order of business
Order of Merit
order of priorities
Order of the Bath
order of the day
order-book
order-form
order-paper
orderliness
orderly
orderly book = order-book
orderly man mil.
orderly officer
orderly rundown
orderly-room
orders on hand econ.
ordinal gram.
ordinance
ordinarily
ordinary
ordinary call
ordinary people
ordinary seaman
ordination
ordnance
ordnance survey
ordure
ore
ore body geol.
ore mining
ore-dressing
Ore. Oregon
oread
Oreg. Oregon
Oregon
org. I organization
organ
organ-blower
organ-grinder
organ-loft
organdie
organdy
organic
organic act
organic law
organic whole
organism
organist
organization
organization chart
organizational
organize
organize the House
organized
organized labour
organized matter
organizer
organotherapy
organs of government
organs of speech
organza
orgasm
orgasmic
orgeat
orgiastic
orgy
oriel
orient
oriental
orientalism
orientalist
orientalize
orientate = orient
orientation
oriented suf.
orienteering
orifice
orig. original
origami
origan
origanum
origin
original
original scientist
original sin rel.
originality
originally
originate
origination
originative
originator
orinasal
orinasal vowel phon.
Orinoco
oriole
Orion
orison
Ork Orkney
Orkney Islands
Orkneys
orlop
ormolu
ornament
ornamental
ornamentation
ornate
ornery
ornithological
ornithologist
ornithology
ornithorhyncus
orogeny
orography
oroide
orotund
orphan
orphanage
orphaned
orphanhood
orphans home
Orphean
Orpheus
Orphic
orpin(e)
Orpington
orrery
orris
orris-powder = orris
orris-root = orris
orthodontist
orthodox
orthodoxy
orthoepy
orthogenesis
orthogonal
orthographic(al)
orthography
orthop(a)edic
orthop(a)edist
orthop(a)edy
orthoptic
ortolan
oryx
Osaka
OSB Order of St. Benedict
Oscar
oscillate
oscillation
oscillation frequency
oscillator
oscillatory
oscillatory circuit radio
oscillograph
oscillotron
osculant
oscular
osculate
osculation
OSD Office of the Secretary of Defense
OSDIT Office of Software Development and Information Technology
osier
osier-bed
Osiris
Oslo
osmium
Osmond
osmose
osmosis
osmotic
Osmund
OSRD Office of Scientific Research and Development
OSS Office of Strategic Services
osseous
ossicle
ossification
ossify
ossuary
osteitis
ostensible
ostensible purpose
ostensory
ostentation
ostentatious
osteography
osteology
osteopath
ostler
OSTP Office of Science and Technology Policy
ostracism
ostracize
ostreiculture
ostrich
ostrich policy
ostrich-farm
ostrich-plume
Ostrogoth
Oswald
OT Old Testament
OTA Office of Technology Assessment
OTB Off-Track Betting
OTC Over The Counter
OTH radar Over The Horizon radar
other
other-worldly
otherness
otherwhence
otherwhere(s)
otherwise
otherwise-minded
otic
otiose
otioseness
otologist
otology
otophone
otoscope
OTR On The Rag
OTS officers training school
Ottawa
otter
otter-dog
Ottilia
ottoman I Ottoman
Ouagadougou
oubliette fr.
ouch I
ought I coll. see nought II
ounce I
Our Lady eccl.
our own period
our pron.
ours pron.
ourself pron.
ourselves pron.
oust
ouster
out
out and about
out and away
out and in see in
out and out
out at feed
out at heels
out match
out of cash
out of collar
out of commission
out of date
out of despair
out of distance
out of doors
out of drawing
out of duty
out of envy
out of fashion
out of favour
out of fix
out of gear
out of gunshot
out of hail
out of hand
out of health
out of hearing
out of heart
out of humour
out of job
out of kilter
out of mind
out of money
out of necessity
out of ones wits
out of place
out of play
out of season
out of the common
out of the ordinary
out of the way
out of time
out of use
out of view
out of whack coll.
out of work
out size
out with
out- pref.
out-and-out
out-and-out war
out-and-outer
out-argue
out-distance
out-Herod
out-jockey
out-of-body
out-of-date
out-of-door(s)
out-of-pocket
out-of-print
out-of-the-way
out-of-town
out-of-work
out-patient
out-patient hospital
out-patient treatment
out-take
out-talk
out-to-out
out-top
out-tray
out-turn = output
outage
outback
outbalance
outbid
outboard
outbound
outbrave
outbreak
outbreak of hostilities
outbuild
outburst
outburst of petulance
outburst of tears
outcast
outclass
outcollege
outcome
outcrop
outcry
outdance
outdare
outdated
outdo
outdoor
outdoor aerial radio
outdoor games
outdoor hands
outdoor pick-up
outdoor speaking
outdoors
outdrive
outer
outer coverings
outer garments
outer space
outermost
outerwear
outface
outfall
outfield
outfight
outfit
outfitter
outflank
outflow
outflow of capital econ.
outfox
outgeneral
outgiving
outgo
outgoing
outgoing tenant
outgrow
outgrowth
outguess
outhouse
outing
outlandish
outlast
outlaw
outlaw strike
outlawry
outlay
outlet
outlet for investment
outlier
outline
outline map
outlive
outlook
outlying
outmanoeuvre
outmarch
outmatch
outmoded
outness
outnumber
outpace
outperform
outplacement
outplay
outpoint
outpost
outpour
outpouring
output
outrage
outrageous
outrange
outrank
outre dress
outre fr.
outreach
outride
outrider
outrigger
outright
outrival
outrun
outrun the constable
outrunner
outsail
outsell
outset
outshine
outside
outside broadcast
outside broker
outside chance
outside expert
outside help
outside left sport
outside limit
outside prices
outside repairs
outside right sport
outside seat
outside work
outsider
outsit
outsize
outskirts
outsmart
outspeak
outspoken
outspoken criticism
outspread
outstanding
outstanding characteristics
outstanding debt
outstay
outstep
outstretched
outstrip
outvalue
outvie
outvoice
outvote
outvoter
outwalk
outward
outward bound
outward form
outward things
outward-bound
outwardly
outwardness
outwards
outwear
outweigh
outwit
outwork
outworker
outworn
outworn quotations
ouzel
oval
ovarian
ovariotomy
ovary
ovate bot. see oval
ovation
oven
oven-bird
ovenproof
over
over against
over the ether
over the phone
over- pref.
over-active
over-capitalize
over-colour
over-estimate
over-expose
over-exposure
over-indulgence
over-measure
over-persuade
over-produce
over-production
over-proof
over-refine
over-simplify
over-the-counter
over-the-counter drugs
overabundance
overabundant
overact
overage I
overall
overall dimensions
overall housing constr.
overall planning
overanxious
overarch
overarm
overawe
overbalance
overbear
overbearing
overbearing manner
overblow
overblown
overboard
overboil
overbold
overbook
overbrim
overbuild
overburden
overbuy
overcame past
overcast
overcharge
overcloud
overcoat
overcoating
overcome
overcome obstacles
overcommitment
overcrop
overcrow
overcrowd
overcrowded
overcrowding
overdevelop
overdo
overdone
overdose
overdraft
overdraught
overdraw
overdressed
overdrink
overdrive
overdue
overdye
overeat
overemphasis
overemphasize
overemployment
overextended
overfall
overfeed
overfill
overflight
overflow
overflow of population
overflowing
overfly
overfulfil
overfulfilment
overfull
overfull employment econ.
overgarment
overgild
overground I
overgrow
overgrown
overgrowth
overhang
overhaul
overhaul base
overhead
overhead charges
overhead costs
overhead crane
overhead expenses
overhead irrigation
overhead railway
overhead road
overhead wire
overhear
overheat
overissue
overjoy
overjoyed
overjump
overkill mil.
overknee
overlabour
overladen
overland
overlap
overlay
overleaf
overleap
overleap oneself
overlie
overling
overlive
overload
overlook
overlooker
overlord
overly
overly cautious
overman I
overmantel
overmasted
overmaster
overmastering
overmatch
overmature
overmature forest
overmuch
overnight
overpass
overpast
overpay
overpeopled
overplay
overplus
overpoise
overpopulation
overpower
overpowering
overpowering beauty
overpraise
overpressure
overpriced
overprint
overprize
overreach
overreach oneself
overreact
overrent
override
overriding
overriding considerations
overripe
overripe wood
overrotten
overrule
overrun
oversea(s)
overseas contingents
overseas service
overseas trade
oversee
overseer
overseer of the poor hist.
oversell
overset
overset ones plans
oversew
oversexed
overshadow
overshoe
overshoot
overshoot ones stop
overshoot oneself
overshoot the mark
overside delivery
overside naut.
oversight
oversize(d)
overslaugh
oversleep
oversleeve
oversmoke
overspend
overspill
overspread
overstaffed
overstate
overstatement
overstay
overstep
overstock
overstrain
overstrain oneself
overstretch
overstrung
oversubscribe
overt
overtake
overtake arrears
overtask
overtax
overtax patience
overthrew past
overthrow
overtime
overtime pay
overtired
overtly
overtone
overtook past
overtop
overtrain
overtrump
overture
overturn
overuse
overvalue
overview
overwatched
overweening
overweening ambition
overweight
overweight luggage
overwhelm
overwhelming
overwhelming majority
overwhelming pressure
overwhelmingly
overwhelmingly grateful
overwhelmingly important
overwind
overwinter
overwork
overwrite
overwrought
oviduct
oviform
ovine
oviparous
oviposit
ovipositor
ovoid
ovule
ovum
owe
Owen
owing
owing to
owl
owl car amer.
owl train amer.
owl-light
owlet
owlish
own
own a child
own faults
own lands
own to
own to the theft
own up coll.
owner
ownerless
ownership
ox
ox-driver
ox-eye
ox-eyed
ox-fence
oxalic
oxbow
Oxbridge
oxcart
oxen
oxford
Oxford blue
Oxford Blues
Oxford gray
Oxford man
Oxfordshire
oxherd
oxhide
oxidation
oxide
oxidize
Oxon. I Oxfordshire
Oxonian
oxtail
oxtail soup
oxter scot.
oxygen
oxygen cutting tech.
oxygen mask
oxygenate
oxygenous
oxygon
oxymoron
oyster
oyster-bank
oyster-farm
oz ounce
ozocerite
ozokerite
ozone
ozonize