Dictionary — O

A personal lexicon of unusual, archaic, scientific, and otherwise interesting words encountered in reading. Browse other letters from the Dictionary catalog.

Word Definition
oaf a person regarded as stupid or clumsy
obdurate hardened in wrongdoing or wickedness; stubbornly impenitent; hardened against feeling; hardhearted. Not giving into persuasion; intractable
oblast division within Soviet state.
oblate flatness or depression at the poles.
obloquy abusively detractive language or utterance; calumny. The condition of disgrace suffered as a result of abuse or vilification; ill repute
obscurantism opposition to the spread of knowledge; deliberate vagueness or abstruseness.
obsequious full of or exhibiting servile compliance; fawning
obstreperous noisy, vociferous; turbulent, unruly, noisily resisting control
obverse adj. facing or turned toward the observer; serving as the counterpart or complement; n. the side of a coin, medal or badge that bears the principal stamp or design; the more conspicuous of two possible alternatives, cases, or sides
occultation (Astronomy) the passage of a celestial body across a line between an observer and another celestial object
oeuvre a work of art; the sum of the lifework of an artist, a writer, or a composer
offal waste parts; rubbish, refuse
ogle tr.v. to stare at; to stare at impertinently, flirtatiously or amorously; intr.v., n.
ogre a person who is felt to be particularly cruel, brutish, or hideous
oleaginous of or relating to oil, falsely or smugly earnest
olivine (chrysolite) a mineral silicate of iron and magnesium, principally (Mg, Fe)2SiO4, found in igneous and metamorphic rocks and used as a structural material in refractories and in cements.
onomastic of, relating to, or explaining a name or names
ontogeny the origin and development of an individual organism from embryo to adult.
ontology branch of metaphysics that deals with nature of being.
opal gem
ophidian of, relating to, or resembling snakes
ophiologist one who studies snakes
oracle n. a person considered to be a source of wise counsel or prophetic opinions. An authoritative or wise statement or prediction
oracular adj. Solemnly prophetic; enigmatic; obscure
oratorio a composition for voices and orchestra telling a sacred story without costumes, scenery or dramatic action
oregano herb of mint family, aromatic leaves.
organ point
orgiastic of, relating to, or characteristic of an orgy
orison prayer.
ornery mean-spirited, disagreeable, and contrary in disposition; cantankerous
orrery a mechanical model of the solar system
otiose lazy, indolent; good for nothing, ineffective, futile
outré outside the bounds of what is usual or proper; eccentric or indecorous
overarching extending over or throughout.
overweening arrogant; immoderate.
oxlip a primrose having yellow flowers clustered in a one-sided umbel.
oxymoron a rhetorical figure in which incongruous or contradictory terms are combined.