a bog plant, Menyanthes trifoliata, of the gentian family, having narrow clusters of white or pink flowers.
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
Historical Examples of buck bean
The bog-bean, or buck-bean, with white lace-like flowers may be seen occasionally in stagnant swamps.The Thames
G. E. Mitton
In the next meadow they came upon beds of Menyanthes—an ugly name, and its common one of buck-bean is not much better.