castor-oil plant n 1: large shrub of tropical Africa and Asia having large palmate leaves and spiny capsules containing seeds that are the source of castor oil and ricin; widely naturalized throughout the tropics [syn: {castor-oil plant}, {castor bean plant}, {palma christi}, {palma christ}, {Ricinus communis}]
Palma Christi \Pal"ma Chris"ti\ [L., palm of Christ.] (Bot.) A plant ({Ricinus communis}) with ornamental peltate and palmately cleft foliage, growing as a woody perennial in the tropics, and cultivated as an herbaceous annual in temperate regions; -- called also {castor-oil plant}. [Sometimes corrupted into {palmcrist}.] [1913 Webster]
Castor oil \Cas"tor oil\ (k[a^]s"t[~e]r oil`). A mild cathartic oil, expressed or extracted from the seeds of the {Ricinus communis}, or {Palma Christi}. When fresh the oil is inodorous and insipid. [1913 Webster] {Castor-oil plant}. Same as {Palma Christi}. [1913 Webster]