Webster's Revised Unabridged Dictionary · 1913

Rosin

Rosin , noun

[A variant of resin.]

The hard, amber-colored resin left after distilling off the volatile oil of turpentine; colophony.
Collocations (1)
Rosin oil , an oil obtained from the resin of the pine tree, -- used by painters and for lubricating machinery, etc.

Rosin , transitive verb

To rub with rosin, as musicians rub the bow of a violin.
Or with the rosined bow torment the string. — Gay