/ Dictionary / Index M melanoma: Meaning and Definition of Find definitions for: mel•a•no•ma Pronunciation: (mel"u-nō'mu), [key] — pl. -mas, -ma•ta any of several types of skin tumors characterized by the malignant growth of melanocytes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: melanoma (Thesaurus) melanoid melanophore Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language