The Collaborative International Dictionary
Crepuscle
Crepuscle \Cre*pus"cle\ (kr[-e]*p[u^]s"s'l), Crepuscule
\Cre*pus"cule\ (kr[-e]*p[u^]s"k[-u]l), n. [L. crepusculum, fr.
creper dusky, dark: cf. F. cr['e]puscule.]
Twilight.
--Bailey.
Wiktionary
crepuscle
n. (alternative form of crepuscule English)