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The Collaborative International Dictionary
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.

Wiktionary
soap tree

n. The tree that bears the soapberry.

WordNet
soap tree

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