1. Any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
   "Pine trees produce rosin as a defence mechanism against insects and pathogens";
   - resin

1. Rub rosin onto
   "rosin the violin bow"

Derived forms: rosined, rosins, rosining

Type of: organic compound, rub

Encyclopedia: Rosin, David