o ... o h m s

o h p farge ... o richardson

o robert frisch ... o'keeffe

o'keeffe, georgia ... o. dix

o. dorticos ... o. k. ed

o. k. ing ... o. struve

o. sverdrup ... o.m.b.

o.n ... oakes ames

oakham ... ob'jectionably

ob'jectively ... obedience training

obedience trial ... object identifier

object language ... objective-relativist

objective-spirit ... oblique co-ordinates

oblique coordinates ... oboval

obovate ... obsessionally

obsessive ... obtain

obtaina'bility ... oc'tennially

oc'tillionth ... occlusal analysis

occlusal equilibration ... ocean ology

ocean perch ... ochna serrulata

ochnaceae ... octahedral

octahedrite ... octogynian

octoic ... odah

odal ... oddsmaker

oddson ... odontoblast

odontoblastic ... odzookers

odzooks ... oenothera biennis

oenothera fruticosa ... of ones own

of ones own accord ... off license

off limits ... off the top of ones head

off the top one head ... off-the-cuff

off-the-face ... office of intelligence support

office of management and budget ... officiation

officiator ... oftentimes

ofttimes ... ohio university

ohio-buckeye ... oil lavender

oil man ... oil-stone

oil-tanker ... okapia johnstoni

okara ... olav ii, saint

olav ii, st ... old geezer

old girl ... old pretender

old pretender james iii ... old-age pension

old-amethyst ... oldfashioned

oldfield ... oleg cassini

oleg cassini loiewski ... oli'garchic

oli'garchical ... oliphant

oliphant, laurence ... oliver twist

oliver w gibbs ... olmutz

olmütz ... omb

ombe ... ommatea

ommateal ... omo

omo- ... on all accounts

on all fours ... on ground

on guard ... on one's beamends

on one's behalf ... on re cord

on re lief ... on the beam

on the beam ends ... on the nose

on the off chance ... on the watch

on the water cart ... on-ramp

on-record ... oncometer

oncoming ... one in a million

one iron ... one's number is up

one's number is was, will be up ... one-thousandth

one-time ... ones fingertips

ones foot door ... onliest

onlimits ... onseam

onseason ... onychoosteodysplasia

onychopathy ... oophoro-

oophorocystectomy ... opacus

opafication ... open document architecture

open document interchange format ... open side

open sight ... open-handedly

open-handedness ... openhearth process

openhousing ... operatic

operatic star ... opers.

opertaneous ... ophthalmitis

ophthalmo ... opisthorchis

opisthorchis felineus ... opposite number, one's

opposite prompt ... opti'mistic

opti'mistical ... optical storage technology association

optical telescope ... opulency

opulent ... oral cavity

oral communication ... orange pekoe

orange red ... oratorship

oratory ... orchardist

orchardman ... order actiniaria

order actinomycetales ... order ebenales

order edentata ... order notostraca

order nudibranchia ... order santalales

order sapindales ... ordinability

ordinable ... oreb

oreb, the rock of ... organ donor

organ grinder ... organismic

organismically ... organpipe cacti

organpipe cactus ... oriental sore

oriental spruce ... orionids

orionis ... ornith-

ornith. ... orohippus

oroide ... orseille

orsellic ... ortho-graphical