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2017 Word of the Year

opacus

[oh-pey-kuh s] /oʊˈpeɪ kəs/
adjective, Meteorology.
1.
(of a cloud) dense enough to obscure the sun or moon.
Origin of opacus
1615-1625
1615-25; < New Latin, Latin opācus; see opaque
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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