Definitions for goa powder
Random House Webster's College Dictionary
a yellow medicinal powder obtained from a Brazilian tree, Andira araroba: the source of chrysarobin.
Origin of Goa powder:
araroba, Goa powder, chrysarobin(noun)
a bitter yellow powder used to treat skin diseases
a bitter powder (also called araroba) found in the interspaces of the wood of a Brazilian tree (Andira araroba) and used as a medicine. It is the material from which chrysarobin is obtained