/ Dictionary / Index C crepuscular: Meaning and Definition of Find definitions for: cre•pus•cu•lar Pronunciation: (kri-pus'kyu-lur), [key] — adj. of, pertaining to, or resembling twilight; dim; indistinct. appearing or active in the twilight, as certain bats and insects. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: crepuscular (Thesaurus) crept crepuscular ray Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language