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asparagus bean

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noun
  1. a trailing, long-stemmed Asian vine, Vigna unguiculata sesquipedalis, of the legume family, having yellow or violet flowers and very long pods.
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Origin of asparagus bean

An Americanism dating back to 1855–60
Also called yard-long bean.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018