CREPUSCULOUS
Adjective
crepusculous (comparative more crepusculous, superlative most crepusculous)
Alternative form of crepuscular
Source: Wiktionary
Cre*pus"cu*lar (-k-lr), Cre*pus"cu*lous (-ls), a. Etym: [Cf. F. cr.]
1. Pertaining to twilight; glimmering; hence, imperfectly clear or
luminous.
This semihistorical and crepuscular period. Sir G. C. Lewis.
2. (Zoöl.)
Definition: 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 Edition