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[oh-pey-kuh s] /oʊˈpeɪ kəs/

adjective, Meteorology.
(of a cloud) dense enough to obscure the sun or moon.


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  • Opah

    [oh-puh] /ˈoʊ pə/ noun 1. a large, deep-bodied, brilliantly colored, oceanic food fish, Lampris regius. /ˈəʊpə/ noun 1. a large soft-finned deep-sea teleost fish, Lampris regius (or luna), of the Atlantic and Pacific Oceans and the Mediterranean Sea, having a deep, brilliantly coloured body: family Lampridae Also called moonfish, kingfish

  • Opafication

    n. 1852, from French opafication; see opacity + -fication.

  • Opal

    [oh-puh l] /ˈoʊ pəl/ noun 1. a mineral, an amorphous form of silica, SiO 2 with some water of hydration, found in many varieties and colors, including a form that is milky white. 2. an iridescent variety of this that is used as a gem. 3. a gem of this. [oh-puh l] /ˈoʊ pəl/ noun […]

  • Opalesce

    [oh-puh-les] /ˌoʊ pəˈlɛs/ verb (used without object), opalesced, opalescing. 1. to exhibit a play of colors like that of the opal. /ˌəʊpəˈlɛs/ verb 1. (intransitive) to exhibit a milky iridescence

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