Rosin

(roz'- in). See Resina, and Colophony Resin. R. -grease. See R. -oil. R.oil, a violet-blue fluorescent liquid, varying in specific gravity from.98 to 1.1, obtained by dry distillation from colophony resin. It is largely used as a lubricant, especially for machinery and wagon wheels. It is used in the condition of " rosin-grease ", and largely as a substitute for linseed-oil in the manufacture of printers' ink. R.-plant. R. -soap, a soap made of rosin and soda or potash. R.-weed, Compa Plant. The plant Silphium lacinia tum secretes an oleo-resin commonly used as a chewing-gum. Tonic, alterative, and emetic. Dose of fld. ext. Unof.