Index of English words, starting with "op"

(1) - Opacity (n.) Obscurity; want of clearness.
(2) - Opacity (n.) The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.

(1) - Opacular (a.) Opaque.

(1) - Opah (n.) A large oceanic fish (Lampris quttatus), inhabiting the Atlantic Ocean. It is remarkable for its brilliant colors, which are red, green, and blue, with tints of purple and gold, covered with round silvery spots. Called also king of the herrings.

(1) - Opal (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.

(1) - Opalescence (n.) A reflection of a milky or pearly light from the interior of a mineral, as in the moonstone; the state or quality of being opalescent.