buckbean

noun
buck·bean | \ˈbək-ˌbēn \

Definition of buckbean 

: a perennial herbaceous plant (Menyanthes trifoliata of the family Menyanthaceae) growing in bogs and having racemes of white or pinkish flowers

First Known Use of buckbean

1578, in the meaning defined above

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The first known use of buckbean was in 1578

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