wild yam

noun
any of several uncultivated yams, especially Dioscorea villosa, of the U.S., having a woody, tuberous root.

Origin:
1835–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
wild yam

noun
having a rhizome formerly dried and used to treat rheumatism or liver disorders 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Drying stems of blue star, false indigo, herbaceous smilax and wild yam can be painted gold for fall.
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