<alchemy> A mixtire of caustic lime and orpiment, or tersulphide of arsenic, used in the depilation of hides. ... See: Rusma. ... (23 Aug 1998) ... Found on http://www.encyclo.co.uk/local/20973
Rhus'ma noun [ See Rusma .] A mixtire of caustic lime and orpiment, or tersulphide of arsenic, -- used in the depilation of hides. Knight. Found on http://www.encyclo.co.uk/webster/R/78