/ Dictionary / Index C chorioma: Meaning and Definition of Find definitions for: cho•ri•o•ma Pronunciation: (kôr"ē-ō'mu, kōr"-), [key] — pl. -mas, -ma•ta any benign or malignant tumor of chorionic tissue; choriocarcinoma. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. chorioid chorion Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language