v. t. [ L. opacatus, p. p. of opacare. ] To darken; to cloud. [ Obs. ] Boyle. [ 1913 Webster ]
n. [ L. opacitas: cf. F. opacité. ]
a. [ L. opacus. See Opaque. ] Opaque. [ R. ] Milton. --
a. Opaque. [ Obs. ] Sterne. [ 1913 Webster ]
n. (Zool.) A large oceanic fish (Lampris guttatus), 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
a. See Opaque. [ 1913 Webster ]
n. [ L. opalus: cf. Gr. &unr_;, Skr. upala a rock, stone, precious stone: cf. F. opale. ] (Min.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. [ 1913 Webster ]
☞ The
v. i.
n. (Min.) 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. [ 1913 Webster ]
a. Reflecting a milky or pearly light from the interior; having an opaline play of colors. [ 1913 Webster ]