soapberry

[ sohp-ber-ee, -buh-ree ]
/ ˈsoʊpˌbɛr i, -bə ri /

noun, plural soap·ber·ries.

the fruit of any of certain tropical or subtropical trees of the genus Sapindus, especially S. saponaria, used as a substitute for soap.
the tree itself.

Origin of soapberry

First recorded in 1685–95; soap + berry

British Dictionary definitions for soapberry

soapberry
/ (ˈsəʊpˌbɛrɪ) /

noun plural -ries

any of various chiefly tropical American sapindaceous trees of the genus Sapindus, esp S. saponaria (or S. marginatus), having pulpy fruit containing saponin
a related plant, S. drummondii, of the southwestern US
the fruit of any of these trees
Also called: chinaberry