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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