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Adjective: crepuscular  kre'pús-kyu-lu(r) or kri'pús-kyu-lu(r)
  1. Of or resembling twilight; dim or indistinct
    "the crepuscular light filtered through the trees"
     
  2. (zoology) active at twilight or before sunrise
    "crepuscular animals like bats and owls"

See also: dark

Encyclopedia: Crepuscular