Source : Webster's Revised Unabridged Dictionary (1913)

Pigment \Pig"ment\, n. [L. pigmentum, fr. the root of pingere to
   paint: cf. F. pigment. See {Paint}, and cf. {Pimento},
   {Orpiment}.]
   1. Any material from which a dye, a paint, or the like, may
      be prepared; particularly, the refined and purified
      coloring matter ready for mixing with an appropriate
      vehicle.

   2. (Physiol.) Any one of the colored substances found in
      animal and vegetable tissues and fluids, as bilirubin,
      urobilin, chlorophyll, etc.

   3. Wine flavored with species and honey. --Sir W. Scott.

   {Pigment cell} (Physiol.), a small cell containing coloring
      matter, as the pigmented epithelial cells of the choroid
      and iris, or the pigmented connective tissue cells in the
      skin of fishes, reptiles, etc.