any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
source: WordNet 3.0
The hard, amber-colored resin left after distilling off the volatile oil of turpentine; colophony.
source: Webster 1913
verb
rub rosin onto
Rosin the violin bow.
source: WordNet 3.0
To rub with rosin, as musicians rub the bow of a violin.
