- castor-oil plant, castor bean plant, palma christi, palma christ, Ricinus communis - 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
--1 is a kind of shrub, bush
--1 is a member of Ricinus, genus Ricinus
--1 has parts: castor bean