Definition of rosin oil
: an oily liquid obtained by destructive distillation of rosin and composed principally of hydrocarbons with some resin acids; especially : the viscous fraction that boils higher than rosin spirit, that when crude is dark-colored and fluorescent and has a sharp odor, and that is used chiefly in making lubricating greases and printing inks, in impregnating paper coverings for electric cables, and in compounding with other oils
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First Known Use of rosin oil
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