ros‧in /ˈrɒzən, ˈrɒzɪn $ ˈrɑː-/
noun [uncountable][
Date: 1200-1300;
Language: Old French;
Origin: resine; ⇒ resin]
a solid slightly sticky substance that you rub on the
bow of a
violin etc, to help it move smoothly on the strings
—rosin verb [transitive] [TahlilGaran] Dictionary of Contemporary English ▲