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obsolescent adj. Passing out of use, as a word. optics n. The science that treats of light and vision, and all that is connected with sight.
obsolete adj. No longer practiced or accepted. optimism n. The view that everything in nature and the history of mankind is ordered for
obstetrician n. A practitioner of midwifery. the best.
obstetrics n. The branch of medical science concerned with the treatment and care of option n. The right, power, or liberty of choosing.
women during pregnancy. optometry n. Measurement of the powers of vision.
obstinacy n. Stubborn adherence to opinion, arising from conceit or the desire to have opulence n. Affluence.
one's own way. opulent adj. Wealthy.
obstreperous adj. Boisterous. oral adj. Uttered through the mouth.
obstruct v. To fill with impediments so as to prevent passage, either wholly or in part. orate v. To deliver an elaborate or formal public speech.
obstruction n. Hindrance. oration n. An elaborate or formal public speech.
obtrude v. To be pushed or to push oneself into undue prominence. orator n. One who delivers an elaborate or formal speech.
obtrusive adj. Tending to be pushed or to push oneself into undue prominence. oratorio n. A composition for solo voices, chorus, and orchestra, generally taken from the
obvert v. To turn the front or principal side of (a thing) toward any person or object. Scriptures.
obviate v. To clear away or provide for, as an objection or difficulty. oratory n. The art of public speaking.
occasion n. An important event or celebration. ordeal n. Anything that severely tests courage, strength, patience, conscience, etc.
Occident n. The countries lying west of Asia and the Turkish dominions. ordinal n. That form of the numeral that shows the order of anything in a series, as first, second, third.
occlude v. To absorb, as a gas by a metal. ordination n. A consecration to the ministry.
occult adj. Existing but not immediately perceptible. ordnance n. A general name for all kinds of weapons and their appliances used in war.
occupant n. A tenant in possession of property, as distinguished from the actual owner. orgies n. Wild or wanton revelry.
occurrence n. A happening. origin n. The beginning of that which becomes or is made to be.
octagon n. A figure with eight sides and eight angles. original adj. Not copied nor produced by imitation.
octave n. A note at this interval above or below any other, considered in relation to that originate v. To cause or constitute the beginning or first stage of the existence of.
other. ornate adj. Ornamented to a marked degree.
octavo n. A book, or collection of paper in which the sheets are so folded as to make eight orthodox adj. Holding the commonly accepted faith.
leaves. orthodoxy n. Acceptance of the common faith.
octogenarian adj. A person of between eighty and ninety years. orthogonal adj. Having or determined by right angles.
ocular adj. Of or pertaining to the eye. orthopedic adj. Relating to the correcting or preventing of deformity
oculist n. One versed or skilled in treating diseases of the eye. orthopedist n. One who practices the correcting or preventing of deformity
oddity n. An eccentricity. oscillate v. To swing back and forth.
ode n. The form of lyric poetry anciently intended to be sung. osculate v. To kiss.
odious adj. Hateful. ossify v. to convert into bone.
odium n. A feeling of extreme repugnance, or of dislike and disgust. ostentation n. A display dictated by vanity and intended to invite applause or flattery.
odoriferous adj. Having or diffusing an odor or scent, especially an agreeable one. ostracism n. Exclusion from intercourse or favor, as in society or politics.
odorous adj. Having an odor, especially a fragrant one. ostracize v. To exclude from public or private favor.
off adj. Farther or more distant. ought v. To be under moral obligation to be or do.
offhand adv. Without preparation. oust v. To eject.
officiate v. To act as an officer or leader. out-and-out adv. Genuinely.
officious adj. Intermeddling with what is not one's concern. outbreak n. A sudden and violent breaking forth, as of something that has been pent up or restrained.
offshoot n. Something that branches off from the parent stock. outburst n. A violent issue, especially of passion in an individual.
ogre n. A demon or monster that was supposed to devour human beings. outcast n. One rejected and despised, especially socially.
ointment n. A fatty preparation with a butter-like consistency in which a medicinal outcry n. A vehement or loud cry or clamor.
substance exists. outdo v. To surpass.
olfactory adj. of or pertaining to the sense of smell. outlandish adj. Of barbarous, uncouth, and unfamiliar aspect or action.
olive-branch n. A branch of the olive-tree, as an emblem of peace. outlast v. To last longer than.
ominous adj. Portentous. outlaw n. A habitual lawbreaker.
omission n. Exclusion. outlive v. To continue to exist after.
omnipotence n. Unlimited and universal power. out-of-the-way adj. Remotely situated.
Omnipotent adj. Possessed of unlimited and universal power. outpost n. A detachment of troops stationed at a distance from the main body to guard
omniscience n. Unlimited or infinite knowledge. against surprise.
omniscient adj. Characterized by unlimited or infinite knowledge. outrage n. A gross infringement of morality or decency.
omnivorous adj. Eating or living upon food of all kinds indiscriminately. outrageous adj. Shocking in conduct.
onerous adj. Burdensome or oppressive. outreach v. To reach or go beyond.
onrush n. Onset. outride v. To ride faster than.
onset n. An assault, especially of troops, upon an enemy or fortification. outrigger n. A part built or arranged to project beyond a natural outline for support.
onslaught n. A violent onset. outright adv. Entirely.
onus n. A burden or responsibility. outskirt n. A border region.
opalescence n. The property of combined refraction and reflection of light, resulting in outstretch v. To extend.
smoky tints. outstrip v. To go beyond.
opaque adj. Impervious to light. outweigh v. To surpass in importance or excellence.
operate v. To put in action and supervise the working of. overdo v. To overtax the strength of.
operative adj. Active. overdose n. An excessive dose, usually so large a dose of a medicine that its effect is
operator n. One who works with or controls some machine or scientific apparatus. toxic.
operetta n. A humorous play in dialogue and music, of more than one act. overeat v. To eat to excess.
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