Se·pi·a n.; pl. E. Sepias L. Sepiae
 1. Zool. (a) The common European cuttlefish. (b) A genus comprising the common cuttlefish and numerous similar species. See Illustr. under Cuttlefish.
 2. A pigment prepared from the ink, or black secretion, of the sepia, or cuttlefish. Treated with caustic potash, it has a rich brown color; and this mixed with a red forms Roman sepia.  Cf. India ink, under India.
 Sepia drawing or Sepia picture, a drawing in monochrome, made in sepia alone, or in sepia with other brown pigments.