opacus

[ oh-pey-kuhs ]

adjectiveMeteorology.
  1. (of a cloud) dense enough to obscure the sun or moon.

Origin of opacus

1
1615–25; <New Latin, Latin opācus;see opaque

Words Nearby opacus

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

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