From The Collaborative International Dictionary of English v.0.44 [gcide]:
Opacity \O*pac"i*ty\, noun [L. opacitas: cf. F. opacit['e].]
1. The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.
2. Obscurity; want of clearness. --Bp. Hall.
From WordNet (r) 2.0 [wn]:
noun
1: the phenomenon of not permitting the passage of electromagnetic radiation [ant: {transparency}]
2: incomprehensibility resulting from obscurity of meaning [syn: {opaqueness}]
3: the quality of being opaque to a degree; the degree to which something reduces the passage of light [syn: {opaqueness}] [ant: {clearness}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
81 Moby Thesaurus words for "opacity": abstruseness, adiaphanousness, ambiguity, amorphousness, asininity, blockishness, boobishness, boorishness, bovinity, cloddishness, cloudiness, crassness, crudeness, dark, darkness, denseness, density, dim-wittedness, dimness, doltishness, dull-wittedness, dullardism, dullness, dumbness, duncery, equivocation, fog, fogginess, fuzziness, grossness, hebetude, impenetrability, impermeability, imperviousness to light, indefiniteness, indeterminateness, indistinctness, intransparency, lethargy, loutishness, lumpishness, mist, mistiness, mumbo jumbo, murk, murkiness, mystification, ninnyism, oafdom, oafishness, obfuscation, obscurantism, obscuration, obscurity, obtuseness, opaque, opaqueness, perplexity, reconditeness, roil, roiledness, shapelessness, simpletonianism, slowness, sluggishness, sottishness, stolidity, stupidity, thick-headedness, thick-wittedness, thickness, turbidity, turbidness, unclarity, unclearness, unintelligibility, unplainness, unteachability, vagueness, wrongheadedness, yokelism
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