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From The Collaborative International Dictionary of English v.0.48:
Ricinus \Ric"i*nus\, n. [L., the castor-oil plant.] (Bot.) A genus of plants of the Spurge family, containing but one species (Ricinus communis), the castor-oil plant. The fruit is three-celled, and contains three large seeds from which castor oil is expressed. See Palma Christi. [1913 Webster]