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1. The castor-oil plant.
2. The poisonous seed of the castor-oil plant, from which castor oil is obtained.
1. (Plants) another name for castor-oil plant
2. (Plants) the seed of this plant
1. the poisonous seed of the castor-oil plant.
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|Noun||1.||castor bean - the toxic seed of the castor-oil plant; source of castor oil|