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Rosetta
Rosetta stone
rosette
rosewood
Rosh Chodesh
Rosh Hashanah
Roshi
Rosicrucian
rosin
rosin oil
Rosinante
rosinweed
Roskilde
RoSPA
Ross River virus
Ross Sea
Ross seal
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rosin

ros·in [ rózzin ]


noun 
Definition:
 
hard resin: a hard translucent resin ranging in color from amber to dark brown. Source: sap, stumps, or other parts of pine trees. Use: varnishes and other products, to increase friction, e.g. between the bow and strings of some stringed instruments.



transitive verb  (past and past participle ros·ined, present participle ros·in·ing, 3rd person present singular ros·ins)
Definition:
 
treat something with rosin: to treat something with rosin, especially to rub rosin on the bow of a stringed instrument to increase friction

[13th century. Alteration of Old French raisine, variant of resine< Latin resina; also via Anglo-Latin rosina< Latin resina]

ros·in·y adjective
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