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Definition of rosin : 1. The hard, amber- colored resin left after distilling off the volatile oil of turpentine; colophony.
2. To rub with rosin, as musicians rub the bow of a violin.

Synonyms:

coal tar, mineral pitch, gum ammoniac, agar, camphor, gutta-percha, asphalt, guaiacum, chicle, gum shellac, oleoresin, frankincense, resin, myrrh, amber, lacquer, copalite, mastic, algin, tar, shellac, pitch, varnish, gum, balsam, ambergris, bitumen, sealing wax

Usage examples:

• " Better put some rosin on your hands," sings out Potter from the ground, where he is arranging the " mechanic" lines. - "Careers of Danger and Daring", Cleveland Moffett.
• The immense popularity and influence of Macaulay had been due to his hatred of half- lights, of " perhapses"; and little as Mr Arnold liked Macaulay's fiddle, he was wise enough to borrow his rosin, albeit in disguise. - "Matthew Arnold", George Saintsbury.
• Annie brought a receipt from Natchez for making candles of rosin and wax, and with great forethought brought also the wick and rosin. - "Strange True Stories of Louisiana", George Washington Cable.