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Melanin

Definition(s)

Amorphous, nonproteinaceous pigment responsible for the brown hue of eyes, skin, hair, various tumors, and certain internal structures including the substantia nigra of the brain.: Definition from: CRISP Thesaurus via Unified Medical Language System at the National Library of Medicine
Pigments causing darkness in skin, hair, feathers, etc. They are irregular polymeric structures and are divided into three groups: allomelanins in the plant kingdom and eumelanins and phaeomelanins in the animal kingdom.: Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
The substance that gives color to skin and eyes.: Definition from: National Cancer Institute dictionary