/ Dictionary / Index C cyclostome: Meaning and Definition of Find definitions for: cy•clo•stome Pronunciation: (sī'klu-stōm", sik'lu-), [key] — adj. belonging or pertaining to the Cyclostomata, a subclass of jawless, eellike, marine vertebrates of the class Agnatha, comprising the lampreys and hagfishes. having a circular mouth. —n. a cyclostome vertebrate; a lamprey or hagfish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cyclostome (Thesaurus) cyclostomatous cyclostrophic Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language