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[oh-pas-i-tee] /oʊˈpæs ɪ ti/

noun, plural opacities.
the state or quality of being .
something .
the degree to which a substance is ; capacity for being .
Photography. the proportion of the light that is absorbed by the emulsion on any given area of a film or plate.
obscurity of meaning.
mental dullness.
Medicine/Medical. an spot or area in normally clear or transparent tissue, as a cataract of the eye.
noun (pl) -ties
the state or quality of being opaque
the degree to which something is opaque
an opaque object or substance
obscurity of meaning; unintelligibility
(physics, photog) the ratio of the intensity of light incident on a medium, such as a photographic film, to that transmitted through the medium
(logic, philosophy) the property of being an opaque context

1550s, “darkness of meaning, obscurity,” from French opacité, from Latin opacitatem (nominative opacitas) “shade, shadiness,” from opacus “shaded, dark, opaque” (see opaque). The literal sense “condition of being impervious to light” first recorded 1630s.

opacity o·pac·i·ty (ō-pās’ĭ-tē)


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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 […]

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