/ Dictionary / Index M melanosome: Meaning and Definition of Find definitions for: me•lan•o•some Pronunciation: (mu-lan'u-sōm", mel'u-nu-), [key] — n. Cell Biol. an organelle in melanocytes that synthesizes and stores melanin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. melanosis melanospermous Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language