Breadcrumb Home > Dictionary > Index M melanospermous: Meaning and Definition of Find definitions for: me•lan•o•sper•mous Pronunciation: (mu-lan"ō-spûr'mus, mel"u-nō-), [key] — adj. having dark spores, as certain seaweeds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. melanosome melanotic ✖ Related Content Daily Word Quiz: sophism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language