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Webster 1913 Edition

Noun.

(Bot.)

A climbing plant of the genus

Menispermum

; – so called from the crescentlike form of the seeds.

moonseed ‎(plural moonseeds)

A twining plant of the genus Menispermum, eponymous of the Menispermaceae or moonseed family
The moonseeds bear black crescent-shaped (hence their name) fruits

Twining plant of genus Menispermum