• synonyms


[oh-pey-kuh s]
adjective Meteorology.
  1. (of a cloud) dense enough to obscure the sun or moon.
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Origin of opacus

1615–25; < New Latin, Latin opācus; see opaque
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for opacus

Historical Examples of opacus

  • The ancestral stock from which A. opacus developed in Micronesia seemingly reached the area from Melanesia.

    The Avifauna of Micronesia, Volume 3

    Rollin H. Baker

  • The structure of its wing resembles that of A. opacus, but the primaries are more rounded.

  • It has a brown iris, and the immatures lack the streaked underparts which are characteristic of A. opacus and other species.

  • Niger opacus lvis, clypeo emarginato, thorace postice rotundato, elytrorum lateribus humeralibus haud incisis.

  • Opacus denotes shady, with reference to a pleasant and beneficial coolness, in opp.