CREPUSCULAR
crepuscular
(adjective) like twilight; dim; “the evening’s crepuscular charm”
Source: WordNet® 3.1
Etymology
Adjective
crepuscular (comparative more crepuscular, superlative most crepuscular)
Of or resembling twilight; dim.
(zoology) Active at or around dusk, dawn or twilight.
Synonyms
• twilightish
Coordinate terms
• diurnal
• nocturnal
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