Also quillaja. [mod.L., f. prec.] a. A genus of S. American rosaceous trees, the bark of which possesses soap-like properties. b. The quillai-tree (see prec.) or its bark (also quillaia-bark).
1848. in Craig.
1866. Treas. Bot., 952/2. Quillaja differs … in the ten stamens being in two instead of one row.
1886. A. W. Stokes, in Pall Mall Gaz., 13 Sept., 10/2. It [ginger-beer] … the head or foam is produced either by white of egg or by quillaia bark.
Hence Quillaic a. in quillaic acid, an acid of quillaia-bark; Quillain, an extract of quillaia-bark (Syd. Soc. Lex., 1897).
1891. W. Martindale, Extra Pharmacop. (ed. 6), 386. The bark … contains quillaic acid and sapotoxin.
