noun
1. : a thickened oil obtained by blowing a fatty oil (as linseed oil or a fish oil) and used in paints and varnishes as a drying oil and in lubricants — called also oxidized oil ; compare bodied oil
2. : a semisolid or solid substance (as an asphalt) obtained by blowing fluid bitumens or residual oils from the distillation of petroleum and used in paints and protective coatings