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opacus

[oh-pey-kuh s] /oʊˈpeɪ kəs/
adjective, Meteorology
1.
(of a cloud) dense enough to obscure the sun or moon.
Origin
1615-1625
1615-25; < Neo-Latin, Latin opācus; see opaque
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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