crepuscular

[Lat. crepuscul(um); and Eng., ., suff. -ar. In Fr. crépusculaire.] I. Ordinary Language: 1. Lit .: In any way pertaining to or connected with the twilight, †2. Fig .: In a state intermediate between light and darkne ; not very clear, somewhat obscure. "The application of the rules of evidence to this semi historical and crepuscular period."- Lewis : Cred. Early Rom. Hist ., ch. xiv., § 3, vol. ii., p. 494. II. Zool .: Pertaining to animals which are active in the dusk or twilight. "Others feed only in the twilight, as bats and owls, and are called crepuscular." - Whewell: Bridge water Treatise (1852), p. 33.