What is "soap tree"

Soapberry tree \Soap"ber`ry tree`\ (Bot.) Any tree of the genus Sapindus, esp. Sapindus saponaria, the fleshy part of whose fruit is used instead of soap in washing linen; -- also called soap tree.

n. The tree that bears the soapberry.

n. tall arborescent yucca of southwestern United States [syn: soapweed, soap-weed, Yucca elata]