| artificial melanin | A dark pigment, resembling melanin, formed from glucosamines in chitin. Synonym: artificial melanin, factitious melanin. (05 Mar 2000) |
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| melanin | <protein> Pigments largely of animal origin. High molecular weight polymers of indole quinone. Colours include black/brown, yellow, red and violet. Found in feathers, cuttle ink, human skin, hair and eyes and in cellular immune responses and wound healing in arthropods. (18 Nov 1997) |
| arsenic pigmentation | Generalised but spotty increased melanin pigmentation of the skin in chronic arsenic poisoning. (05 Mar 2000) |
| pigmentation | 1. The deposition of colouring matter, the colouration or discolouration of a part by pigment. 2. Colouration, especially abnormally increased colouration, by melanin. (18 Nov 1997) |
| skin pigmentation | Colouration of the skin. (12 Dec 1998) |
| exogenous pigmentation | Discoloration of the skin or tissues by a pigment introduced from without. (05 Mar 2000) |