/ Dictionary / Index S serotine: Meaning and Definition of Find definitions for: ser•o•tine Pronunciation: (ser'u-tin, -tīn"), [key] — adj. late in occurring, developing, or flowering. ser•o•tine Pronunciation: (ser'u-tin, -tīn"), [key] — n. a small Eurasian brown bat, Eptesicus serotinus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: serotine (Thesaurus) serotinal serotonergic Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language