Me‐lan″o‐sperm (?), n. [Gr. μέλασ, -ανοσ, black + σπέρμα seed.] (Bot.) An alga of any kind that produces blackish spores, or seed dust. The melanosperms include the rockweeds and all kinds of kelp. — Mel′a‐no‐sper″mous (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.