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The Collaborative International Dictionary
Soapberry 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.

WordNet
soapberry tree

n. a tree of the genus Sapindus whose fruit is rich in saponin [syn: soapberry]