Definition: menyanthes trifoliata

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Source: WordNet (r) 1.7 

Menyanthes trifoliata
     n : perennial plant of Europe and America having racemes of
         white or purplish flowers and intensely bitter trifoliate
         leaves; often rooting at water margin and spreading
         across the surface [syn: water shamrock, buckbean, bogbean,
          bog myrtle, marsh trefoil, Menyanthes trifoliata]

Source: Webster's Revised Unabridged Dictionary (1913) 

Buck bean \Buck" bean`\ (b[=e]n`). (Bot.)
   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.