'Pigmentation' definitions:

Definition of 'pigmentation'

From: WordNet
noun
The deposition of pigment in animals or plants or human beings
noun
Coloration of living tissues by pigment [ant: depigmentation]

Definition of 'Pigmentation'

From: GCIDE
  • Pigmentation \Pig`men*ta"tion\, n. (Physiol.) A deposition, esp. an excessive deposition, of coloring matter; as, pigmentation of the liver. [1913 Webster]