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From The Collaborative International Dictionary of English v.0.48:
Oleograph \O`le*o*graph\, 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]