Dictionary

jack bean

noun

Definition of JACK BEAN

:  a bushy annual tropical American legume (Canavalia ensiformis) grown especially for forage

First Known Use of JACK BEAN

1885

jack bean

noun \ˈjak-ˌbēn\   (Medical Dictionary)

Medical Definition of JACK BEAN

1
:  an annual tropical American plant of the genus Canavalia; especially :  a plant (C. ensiformis) having long pods with white seeds and grown especially for forage
2
:  the seed of the jack bean that is a source of canavalin and urease

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