a bog plant, Menyanthes trifoliata, of the gentian family, having narrow clusters of white or pink flowers.
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Origin of buck bean
1570–80; earlier buckes bean, translation of Dutch boksboon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for buck bean
In the next meadow they came upon beds of Menyanthes—an ugly name, and its common one of buck-bean is not much better.Happy Days for Boys and Girls|Various