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opacus

 - 1 dictionary result

o⋅pa⋅cus

[oh-pey-kuhs]
–adjective Meteorology.
(of a cloud) dense enough to obscure the sun or moon.

Origin:
1615–25; < NL, L opācus; see opaque
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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