Cre-pŭs'cu-lar or Cre-pŭs'cu-loŭs, a.
a. [Fr. crépusculaire. See supra.]
Sense 1. Pertaining to twilight; glimmering; resembling the imperfect light of the morning and evening; hence, imperfectly clear or luminous.
Sense 2. (Ornith. & Entom.) Flying in the evening, or before sunrise;—said of certain birds and insects.