Buck bean

1. A plant (Menyanthes trifoliata) which grows in moist and boggy places, having racemes of white or reddish flowers and intensely bitter leaves, sometimes used in medicine; marsh trefoil; — called also bog bean.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.