quillay
/kɪˈlʌɪ/(also quillai)
noun
The soapbark tree, Quillaja saponaria.
Origin
Early 18th century. From Mapuche quillai, quillay soapbark tree, also the bark of this tree (also formerly sometimes spelt cúllay; from quillcan to wash); originally via French quillay. Compare Spanish quillay.