A solid form of resin obtained from pines and some other plants, mostly conifers, used in varnishes, adhesives, and as a friction-increasing substance on the bows of string instruments.

The violinist applied rosin to her bow to ensure a smooth and clear sound.

A cake, block, or powdered preparation of rosin used by musicians, athletes, or workers to improve grip or friction.

Before stepping onto the mound, the pitcher dusted his fingers with rosin.

rosinverb

To apply rosin to a surface, especially to the bow of a stringed instrument, to increase friction.

The violinist took a moment to rosin her bow before the performance.

rosinadjective

Made of, containing, or treated with rosin.

The violinist preferred rosin-coated strings for a warmer tone.