Oil'-tree, n.

n. (Bot.) (a.) A plant of the genus Ricinus (R. communis), from the seeds of which castor-oil is obtained. (b.) An Indian tree of the genus Bassia (B. longifolia), from the seeds of which a kind of oil is obtained which is used by the Hindoos for their lamps, for soap, and for cooking. Baird. (c.) The oil-palm.