/ Dictionary / Index C cyclostomatous: Meaning and Definition of Find definitions for: cy•clo•stom•a•tous Pronunciation: (sī"klu-stom'u-tus, -stō'mu-, sik"lu-), [key] — adj. having a circular mouth. belonging or pertaining to the cyclostomes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cyclosporine cyclostome Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language