cre·pus·cu·lar

[kri-puhs-kyuh-ler]
adjective
1.
of, pertaining to, or resembling twilight; dim; indistinct.
2.
Zoology. appearing or active in the twilight, as certain bats and insects.

Origin:
1660–70; crepuscule + -ar1

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World English Dictionary
crepuscular (krɪˈpʌskjʊlə) [Click for IPA pronunciation guide]
 
adj
1.  of or like twilight; dim
2.  (of certain insects, birds, and other animals) active at twilight or just before dawn
 
[C17: from Latin crepusculum dusk, from creper dark]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Crepuscular is always a great word to know.
So is annelida. Does it mean:
animal phylum comprised of sponges
phylum comprised of annelids
Dictionary.com's 21st Century Lexicon
Main Entry:  crepuscular1
Part of Speech:  adj
Definition:  pertaining to twilight, esp. in dimness
Etymology:  Latin crepusculum
Main Entry:  crepuscular2
Part of Speech:  adj
Definition:  appearing or active at twilight
Etymology:  Latin crepusculum
Usage:  zoology
Dictionary.com's 21st Century Lexicon
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Etymonline
Word Origin & History

crepuscular
fig. use from 1660s; lit. use from 1755, from L. crepusculum "twilight." Especially of morning twilight.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some animals are crepuscular mostly because their prey is crepuscular.
River otters are generally nocturnal or crepuscular, so early morning or late
  evening is the best time to see them.
Mosquitos are crepuscular, active primarily at dawn and dusk.
Learn more about these crepuscular mammals in the wildlife category of our
  website.
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