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English definition of “rosin”

rosin

noun [U]     /ˈrɒz.ɪn/ US  /ˈrɑː.zən/
yellow resin (= sticky substance produced by certain trees and plants) that has become hard, used especially on the hairs of bows of stringed musical instruments to prevent the hairs from sliding over the stringsPolishing and polishes
(Definition of rosin noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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