Castor-bean definition

The castor-oil plant.
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The poisonous seed of the castor-oil plant, from which castor oil is obtained.
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The large, highly poisonous, beanlike seed of the castor-oil plant.
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The plant itself.
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The castor-oil plant.
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The poisonous seed of the castor-oil plant, from which castor oil is obtained.
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The seed of the castor oil plant, Ricinus communis; used in the production of castor oil and of the poison ricin.
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Other Word Forms

Noun

Singular:
castor-bean
Plural:
castor-beans

Origin of castor-bean

  • castor (oil) bean

    From American Heritage Dictionary of the English Language, 5th Edition