moonseed

[moon-seed]
noun
1.
any climbing plant of the genus Menispermum, having greenish-white flowers and crescent-shaped seeds.

Origin:
1730–40; moon + seed

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
moonseed (ˈmuːnˌsiːd)
 
n
any menispermaceous climbing plant of the genus Menispermum and related genera, having red or black fruits with crescent-shaped or ring-shaped seeds

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

moonseed

any of three species of woody vines constituting the genus Menispermum of the family Menispermaceae (order Ranunculales). They occur in East Asia, eastern North America, and Mexico. The North American species, Canada moonseed, or yellow parilla (M. canadense), with lobed leaves and greenish-white flowers, bears black, grapelike fruit with crescent-shaped seeds. M. dauricum, from East Asia, and M. mexicanum, from Mexico, have similar properties. In particular, the seeds of all these species may cause a curare-like poisoning; one of the ingredients in curare comes from another member of Menispermaceae (Chondrodendron tomentosum).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
If it has a single seed in the shape of a crescent moon, it's moonseed, which is thought to be poisonous.
Moonseed vines are neither woody nor easily shredded.
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