Crepuscular
Pronunciation : Cre*pus"cu*lar (-k-lr), Cre*pus"cu*lous (-ls)
Part of Speech : a.
Etymology : [Cf. F. cr.]
Definition : 1. Pertaining to twilight; glimmering; hence, imperfectly clear or luminous. This semihistorical and crepuscular period. Sir G. C. Lewis.
2. (Zo?l.)
Defn: 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.
Source : Webster's Unabridged Dictionary, 1913