Cre*pus"cu*lar (-k?-l?r), Cre*pus"cu*lous (-l?s), a. [Cf. F. crpusculaire.]

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.

 

© Webster 1913.