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Answer for the clue "A bitter yellow powder used to treat skin diseases ", 11 letters:
chrysarobin

Word definitions for chrysarobin in dictionaries

WordNet Word definitions in WordNet
n. a bitter yellow powder used to treat skin diseases [syn: araroba , Goa powder ]

Wiktionary Word definitions in Wiktionary
n. (context organic compound English) A bitter yellow substance forming the essential constituent of Goa powder, and yielding chrysophanic acid.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Chrysarobin \Chrys`a*ro"bin\, n. [Gr. chryso`s gold + araroba a foreign name of Goa powder + -in.] (Chem.) A bitter, yellow substance forming the essential constituent of Goa powder, and yielding chrysophanic acid proper; hence formerly called also chrysphanic ...

Usage examples of chrysarobin.

Chrysarobin is a reduced quinone, and chrysophanic acid (also found in rhubarb yellow lichen, Buckthorn Berries, Rumox Eckolianus, a South African dock, etc.

The action of chrysarobin on the skin is not due to germicidal properties, but to its chemical affinity for the keratin elements of the skin.

A drachm of chrysarobin may be dissolved in a fluid ounce of official flexible collodion, painted over the parts with a camel's- hair brush, and the part coated with plain collodion to avoid staining the clothing.