Source : Webster's Revised Unabridged Dictionary (1913)

Cosmoline \Cos"mo*line\ (k?z"m?-l?n), n. [Prob. fr. cosmetic +
   L. oleum oil.] (Chem.)
   A substance obtained from the residues of the distillation of
   petroleum, essentially the same as vaseline, but of somewhat
   stiffer consistency, and consisting of a mixture of the
   higher paraffines; a kind of petroleum jelly.