<p><strong>Noun</strong></p><ul><li>Chemistry:<ul><li>A yellowish to amber, translucent, hard, brittle, fragmented resin left after distilling the oil of turpentine from the crude oleoresin of the pine.</li><li>Used chiefly in making varnishes, varnish and paint driers, printing inks, and for rubbing on the bows of such string instruments as the violin.</li><li>Resin.</li></ul></li></ul><p><strong>Verb</strong></p><ul><li>(used with object):<ul><li>To cover or rub with rosin.</li></ul></li></ul>