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O'PAL, n. [L. opalus or opalum.] A stone of the silicious genus, and of several ...
OPA'KENESS, n. The quality of being impervious to light; want of transparency; o...
OPA'KE, a. [L. opacus.] 1. Impervious to the rays of light; not transparent. [Th...
O'PAH, n. A fish of a large kind with a smooth skin found on the coast of Guinea.
OPA'COUSNESS, n. Imperviousness to light.
OPA'COUS, a. [L. opacus.] 1. Not pervious to the rays of light; not transparent....
OPAC'ITY, n. [L. opacitas.] 1. Opakeness; the quality of a body which renders it...
O'PACATE, v.t. [L. opaco.] To shade; to darken; to obscure; to cloud. [Not used.]
OOZ'Y, a. Miry; containing soft mud; resembling ooze; as the oozy bed of a river.
OOZ'ING, ppr. Flowing gently; percolating.
OOZE, v.i. ooz. [The origin of this word is not easily ascertained. Heb. See Iss...
O'OLITE, n. [Gr. an egg, and stone, from its resemblance to the roes of fish.] E...
ON'YX, n. [Gr. a nail. L. onyx.] A semi-pellucid gem with variously colored zone...
ON'YCHA, n. [from Gr.] Supposed to be the odoriferous shell of the onyxfish, or ...
ON'WARD, adv. [L. versus.] 1. Toward the point before or in front; forward; prog...
ONTOL'OGY, n. [Gr. from and discourse.] That part of the science of metaphysics ...