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Pronunciation varies by accent · noun
(archaic) An alga of any kind that produces blackish spores, or seed dust..
The melanosperms include the rockweeds and all kinds of kelp.
Use melanosperm when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Melanosperm means (archaic) An alga of any kind that produces blackish spores, or seed dust..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The melanosperms include the rockweeds and all kinds of kelp.
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