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单词 melanin
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WordReference Random House Learner's Dictionary of American English © 2024
mel•a•nin /ˈmɛlənɪn/USA pronunciation   n. [uncountable]
  1. Biochemistrycoloring matter found in animal life, making up the dark color of skin, hair, fur, scales, and feathers.

WordReference Random House Unabridged Dictionary of American English © 2024
mel•a•nin  (mel′ə nin),USA pronunciation n. 
  1. Biochemistryany of a class of insoluble pigments, found in all forms of animal life, that account for the dark color of skin, hair, fur, scales, feathers, etc.
  • melan- + -in2 1835–45
mel′a•nin•like′, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
melanin /ˈmɛlənɪn/ n
  1. any of a group of black or dark brown pigments present in the hair, skin, and eyes of man and animals: produced in excess in certain skin diseases and in melanomas
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