A bitter yellow powder used to treat skin diseases WordNet 3.0 & Open English WordNet

Araroba powder, also known as Bahia powder and Goa powder, is a drug occurring in the form of a yellowish-brown powder, varying considerably in tint, from the Portuguese colony of Goa, where it appears to have been introduced about the year 1852. Wikipedia

Araroba; a bitter powder found in the interspaces of the wood of a Brazilian tree (Vataireopsis araroba) and used as a medicine. Wiktionary

A bitter powder found in the Andira araroba tree, used as a medicine. Wiktionary (translation)

Goa powder. Wiktionary

A bitter yellow substance forming the essential constituent of Goa powder, and yielding chrysophanic acid. Wiktionary