castor beancastor bean
- the large, highly poisonous, beanlike seed of the castor-oil plant
- the plant itself
Origin of castor beanprobably from past use of oil to replace castor
- The castor-oil plant.
- The poisonous seed of the castor-oil plant, from which castor oil is obtained.
Origin of castor beancastor (oil) bean
(plural castor beans)