Melanosperm
Pronunciation : Me*lan"o*sperm
Part of Speech : n.
Etymology : [Gr. (Bot.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913