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.
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Sapindus saponaria
n : evergreen of tropical America having pulpy fruit containing
saponin which was used as soap by native Americans [syn:
China tree, false dogwood, jaboncillo, chinaberry]