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WordReference Random House Learner's Dictionary of American English © 2024ros•in /ˈrɑzɪn/USA pronunciation n. [uncountable]- Chemistrya yellowish, brittle substance that remains after removing turpentine oil from pine oil:Rosin is used in making varnishes.
- resin.
WordReference Random House Unabridged Dictionary of American English © 2024ros•in (roz′in),USA pronunciation n. Also called colophony. - Chemistrythe yellowish to amber, translucent, hard, brittle, fragmented resin left after distilling the oil of turpentine from the crude oleoresin of the pine: used chiefly in making varnishes, varnish and paint driers, printing inks, and for rubbing on the bows of such string instruments as the violin.
- resin.
v.t. - to cover or rub with rosin.
- Old French, variant of resine resin
- Middle English 1300–50
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