Pigmentation

[pɪgm(ə)n'teɪʃ(ə)n] or [,pɪɡmɛn'teʃən]

(noun.) coloration of living tissues by pigment.

(noun.) the deposition of pigment in animals or plants or human beings.

Edited by Bonita--From WordNet

(n.) A deposition, esp. an excessive deposition, of coloring matter; as, pigmentation of the liver.

Checked by Dale