soapberry
/ˈsəʊpbərɪ/noun
1- a tree or shrub with berries that produce a soapy froth when crushed, in particular无患子, 尤指：
1.1
- a plant with saponin-rich berries that are used as a soap substitute (genus Sapindus, family Sapindaceae).无患子属植物（无患子属, 无患子科）。
1.2
- a North American shrub with edible berries (Shepherdia canadensis, family Elaeagnaceae).加拿大水牛果（拉丁名Shepherdia canadensis,胡颓子科）。
1.3
- the berry of any of these plants无患子果实。