mineral oil vs. mineral spirits

a colorless, oily, almost tasteless, water-insoluble liquid, usually of either a standard light density light mineral oil or a standard heavy density heavy mineral oil, consisting of mixtures of hydrocarbons obtained from petroleum by distillation: used chiefly as a lubricant, in the manufacture of cosmetics, and in medicine as a laxative.

a volatile distillation product of petroleum, used as a thinner for paints and varnishes. Compare naphtha ( def 1 ).