/ Dictionary / Index C cystoid: Meaning and Definition of Find definitions for: cyst•oid Pronunciation: (sis'toid), [key] — adj. resembling a cyst. —n. a cystlike structure or formation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cystocele cystolith 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