castor bean(redirected from pei-ma)
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A genus of plants (family Euphorbiaceae) with one species, Ricinus communis, the castor oil plant, the source of castor oil; the leaves are said to be a galactagogue.
Synonym(s): castor bean
1. The castor-oil plant.
2. The poisonous seed of the castor-oil plant, from which castor oil is obtained.
castor beanHerbal medicine
The kernel of the seeds of Ricinus communis, which contain the highly toxic ricin and ricinine.
cas·tor bean(kast'ŏr bēn)
see ricinus communis.