quillaja
noun
quil·la·ja
| \ kwi-ˈlā-yə
, -jə
\
, -jə
\
Medical Definition of quillaja
1
capitalized
: a genus of trees (family Quillajaceae) native to Brazil, Peru, and Chile, distinguished by their saponaceous bark, and including the soapbark (Q. saponaria)
2
: soapbark sense 2