The Collaborative International Dictionary
Crepusculous
Crepuscular \Cre*pus"cu*lar\ (-k?-l?r), Crepusculous \Cre*pus"cu*lous\ (-l?s), a. [Cf. F. cr['e]pusculaire.]
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Pertaining to twilight; glimmering; hence, imperfectly clear or luminous.
This semihistorical and crepuscular period.
--Sir G. C. Lewis. -
(Zo["o]l.) 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.
Wiktionary
crepusculous
a. (alternative form of crepuscular English)