• WordNet 3.6
    • n moonseed plant of the family Menispermaceae having red or black fruit with crescent- or ring-shaped seeds
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Webster's Revised Unabridged Dictionary
    • n Moonseed (Bot) A climbing plant of the genus Menispermum; -- so called from the crescentlike form of the seeds.
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Century Dictionary and Cyclopedia
    • n moonseed A plant of the genus Menispermum.
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In literature:

When she finished she picked up a trailing vine of moonseed.
"The Harvester" by Gene Stratton Porter