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Entry 1 sense Webster, 1913

Castor bean

/kăs'-tẽr bēn/ · Cas·tor bean · IPA
01 The bean or seed of the castor-oil plant (Ricinus communis, or Palma Christi.)
  1. 1.
    The bean or seed of the castor-oil plant (Ricinus communis, or Palma Christi.)(Bot.)