/ Dictionary / Index Y yam: Meaning and Definition of Find definitions for: yam Pronunciation: (yam), [key] — n. the starchy, tuberous root of any of various climbing vines of the genus Dioscorea, cultivated for food in warm regions. any of these plants. the sweet potato. potato (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: yam (Thesaurus) Yalu Yama Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language