Cre·pus·cu·lar Cre·pus·cu·lous a.
1. Pertaining to twilight; glimmering; hence, imperfectly clear or luminous.
This semihistorical and crepuscular period. --Sir G. C. Lewis.
2. Zool. Flying in the twilight or evening, or before sunrise; -- said certain birds and insects.
Others feed only in the twilight, as bats and owls, and are called crepuscular. --Whewell.
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