n. [ L. oleum oil + -graph. ] 1. (Chem.) The form or figure assumed by a drop of oil when placed upon water or some other liquid with which it does not mix. [ 1913 Webster ]

2. (Painting) A picture produced in oils by a process analogous to that of lithographic printing. [ 1913 Webster ]

n. 1. Art or process of producing the pictures known as oleographs. [ Webster 1913 Suppl. ]

2. A process of identifying oils by their oleographs. [ Webster 1913 Suppl. ]