Etymology
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rosin (n.)

"distillate of turpentine," especially when in a solid state and employed for ordinary purposes, late 13c., from Old French raisine, rousine, variants of résine (see resin). The verb, "to cover or rub with rosin," is from mid-14c. Related: Rosined; rosining.

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Definitions of rosin
1
rosin (v.)
rub rosin onto;
rosin the violin bow
2
rosin (n.)
any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules;
Synonyms: resin
From wordnet.princeton.edu