from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The castor-oil plant.
  • n. The poisonous seed of the castor-oil plant, from which castor oil is obtained.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The seed of the castor oil plant, Ricinus communis; used in the production of castor oil and of the poison ricin.

from the GNU version of the Collaborative International Dictionary of English

  • The bean or seed of the castor-oil plant (Ricinus communis, or Palma Christi.)

from The Century Dictionary and Cyclopedia

  • n. See bean.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the toxic seed of the castor-oil plant; source of castor oil


castor (oil) + bean.
(American Heritage® Dictionary of the English Language, Fourth Edition)


Sorry, no example sentences found.


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  • The fruit of that plant, the castor bean, contains a supertoxic level of the poison ricin. As little as one bean, well chewed, could prove fatal.

    February 27, 2015