any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
<noun.substance> [ verb ]
rub rosin onto
<verb.contact> rosin the violin bow
Rosin \Ros"in\, n. [A variant of resin.] The hard, amber-colored resin left after distilling off the volatile oil of turpentine; colophony.
{Rosin oil}, an oil obtained from the resin of the pine tree, -- used by painters and for lubricating machinery, etc.
Rosin \Ros"in\, v. t. To rub with rosin, as musicians rub the bow of a violin.
Or with the rosined bow torment the string. --Gay.