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]
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