crepuscular

[ kri-puhs-kyuh-ler ]
/ krɪˈpʌs kyə lər /

adjective

of, relating to, or resembling twilight; dim; indistinct.
Zoology. appearing or active in the twilight, as certain bats and insects.

Origin of crepuscular

First recorded in 1660–70; crepuscule + -ar1
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British Dictionary definitions for crepuscular

crepuscular

/ (krɪˈpʌskjʊlə) /

adjective

of or like twilight; dim
(of certain insects, birds, and other animals) active at twilight or just before dawn

Word Origin for crepuscular

C17: from Latin crepusculum dusk, from creper dark
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012