Crepuscular Definition
 krĭ-pŭskyə-lər 
    adjective
  
 Of or like twilight; dim.
 Webster's New World 
Active at twilight or just before sunrise.
 Crepuscular insects.
 Webster's New World 
Occurring at dawn or dusk or both.
 Crepuscular foraging; a crepuscular stroll through the park.
 American Heritage 
Origin of Crepuscular
-  From Latin crepusculum + -ar. From Wiktionary 
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