Definition of melanin noun from the Oxford Advanced Learner's Dictionary

 

melanin

 noun
noun
BrE BrE//ˈmelənɪn//
 
; NAmE NAmE//ˈmelənɪn//
 
[uncountable](specialist)
 
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a dark substance in the skin and hair that causes the skin to change colour in the sun’s light Word Origin mid 19th cent.: from Greek melas, melan- ‘black’ + -in.
See the Oxford Advanced American Dictionary entry: melanin