castorbean

castor bean

noun
1.
the seed of the castor-oil plant.

Origin:
1810–20, Americanism; short for castor-oil bean

castor-bean, adjective
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Collins
World English Dictionary
castor bean
 
n
1.  another name for castor-oil plant
2.  the seed of this plant

Collins English Dictionary - Complete & Unabridged 10th Edition
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