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crepuscular

[kri-puhs-kyuh-ler] /krɪˈpʌs kyə lər/
adjective
1.
of, relating to, or resembling twilight; dim; indistinct.
2.
Zoology. appearing or active in the twilight, as certain bats and insects.
Origin of crepuscular
1660-1670
1660-70; crepuscule + -ar1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for crepuscular

crepuscular

/krɪˈpʌskjʊlə/
adjective
1.
of or like twilight; dim
2.
(of certain insects, birds, and other animals) active at twilight or just before dawn
Word Origin
C17: from Latin crepusculum dusk, from creper dark
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for crepuscular
adjective

appearing or active at twilight

Word Origin

Latin crepusculum

Usage Note

zoology

Dictionary.com's 21st Century Lexicon
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Word Origin and History for crepuscular
adj.

figurative use from 1660s; literal use from 1755, from Latin crepusculum "twilight, dusk," from creper "dusky," of unknown origin. Especially of evening twilight.

Online Etymology Dictionary, © 2010 Douglas Harper
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