O Latin Derivatives

obliquus

oblique, obliquity

obliviscor

oblivion, oblivious

obscenus

obscene, obscenity

obscurus

obscure, obscurity

octo

octave, octavo

oculus

antler, binocular, eyelet, inoculate, inoculation, inveigle, monocle, ocular, oculist

odi

annoy, ennui, noisome, odious

odor

odoriferous, odorous

offendo

offend, offense

oleo

olfactory, redolent

omen

abomination, abominable, ominous

omnis

omnipotence, omnipotent, omnipresent, omniscience, omniscient, omnivorous, omnivore

onus

onerous

opacus

opaque

operio

cover, coverlet, covert, covertly, coverture, curfew, discover, discoverer, discovery, handkerchief, kerchief, rediscover, uncover, undiscover

opinor

opine, opinion

ops

copious, coplously, copy, copybook, copyist, copyright, cornucopia, office, officer, official, officially, officiate, officious, opulence, opulent, unofficial

optimus

optimism

opto

adopt, option

opus

cooperate, cooperation, cooperative, inoperative, inure, maneuver, manoeuver, manure, operate, operatic, operation, operative, operator

orbis

exorbitant, orb, orbit

ordior

primordial

ordo

coordinate, coordination, disorder, disorderly, extraordinarily, extraordinary, inordinate, inordinately, insubordinate, ordain, order, orderly, ordinance, ordinarily, ordinary, ordination, ordnance, preordain, subordinate, subordination, well-ordered

orior

aboriginal, aborigines, abortion, abortive, orient, oriental, orientation, origin, original, originality, originally, originate, originator

orno

adorn, adornment, ornament, ornamental, ornamentation, ornate, suborn

oro

adorable, adoration, adore, inexorable, inexorably, oracle, oracular, oration, oratorial, oratorio, oratory, orison, peroration

os(oris)

oral, orifice, usher

os(ossis)

osprey, ossify

otium

negotiate, negotiation

ovo

ovation

ovum

oval, ovary, ovule