The Collaborative International Dictionary
Rhusma
Rhusma \Rhus"ma\, n. [See Rusma.]
A mixtire of caustic lime and orpiment, or tersulphide of
arsenic, -- used in the depilation of hides.
--Knight.
Wiktionary
rhusma
n. A mixture of caustic lime and orpiment, or tersulphide of arsenic, used in the depilation of hides.