Quillaia bark

Quil`la´ia bark`

1.(Bot.) The bark of a rosaceous tree (Quillaja Saponaria), native of Chile. The bark is finely laminated, and very heavy with alkaline substances, and is used commonly by the Chileans instead of soap. Also called soap bark.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.