/ Dictionary / Index C cleistogamous: Meaning and Definition of Find definitions for: cleis•tog•a•mous Pronunciation: (klī-stog'u-mus), [key] — adj. Bot. pertaining to or having pollination occurring in unopened flowers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cleistogamous (Thesaurus) cleistocarpous cleistothecium Related Content Daily Word Quiz: menagerie Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language