Definition of quillaia in US English:

quillaia

(also quillaja, quillaya)

noun

  • Any of various South American trees constituting the genus Quillaja (family Rosaceae); especially the soapbark tree, Q. saponaria, of the Chilean and Peruvian Andes; (in form Quillaja) the genus itself. Also: the saponin-rich inner bark of this tree or an extract made from it, used as a substitute for soap, a food additive, etc.

Origin

Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From scientific Latin Quillaja, genus name (G. I. Molina Saggio sulla storia naturale del Chili 354; also as Quillaia, Quillaya) from Mapuche quillai + scientific Latin -a.

Pronunciation

quillaia

/kwɪˈleɪə/