pheomelanin

noun
pheo·​mel·​a·​nin | \ ˌfē-ə-ˈme-lə-nən How to pronounce pheomelanin (audio) \
variants: or less commonly phaeomelanin
plural pheomelanins also phaeomelanins

Definition of pheomelanin

: a reddish-yellow sulfur-containing melanin pigment formed in the presence of cysteine … in people with dark brown or black hair, the pheomelanin is effectively masked by the darker eumelanin.— Erin Brodwin The marked spectrum of color and diversity of patterns … in mammals arises, unexpectedly, from variation in the quantity, quality, and regional distribution of just two types of pigment—black eumelanin and yellow pheomelanin.— Sophie I. Candille et al. — compare eumelanin, neuromelanin

First Known Use of pheomelanin

1924, in the meaning defined above

History and Etymology for pheomelanin

borrowed from German Phäomelanin, from Greek phaiós "a shade between black and white, gray, dark gray" (of obscure origin) + Melanin melanin

Note: The term Phäomelanin was apparently introduced, along with Eumelanin eumelanin, by the biologist Karl Görnitz in "Versuch einer Klassifikation der häufigsten Federfärbungen," Journal für Ornithologie, Band 71 (1923), Heft 1, pp. 127-31. On the meaning of the element phäo-/pheo- see the note at pheochromocytoma.

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The first known use of pheomelanin was in 1924

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Dictionary Entries Near pheomelanin

pheochromocytoma

pheomelanin

pheon

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Cite this Entry

“Pheomelanin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pheomelanin. Accessed 18 Oct. 2021.

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More Definitions for pheomelanin

pheomelanin

noun
pheo·​mel·​a·​nin
variants: also phaeomelanin \ ˌfē-​ə-​ˈmel-​ə-​nən How to pronounce pheomelanin (audio) \

Medical Definition of pheomelanin

: a reddish-yellow sulfur-containing melanin pigment formed in the presence of cysteine As pH reduces, there is a progressive reduction in tyrosinase activity leading to increased pheomelanin and reddish or blonde hair.— Anagha Kumar et al., International Journal of Trichology Modern melanosomes generally carry a mixture of two melanin pigments: dark brown-black eumelanin and red-yellow pheomelanin.— Meghan Rosen, Science News The marked spectrum of color and diversity of patterns that we see in mammals arises, unexpectedly, from variation in the quantity, quality, and regional distribution of just two types of pigment—black eumelanin and yellow pheomelanin.— Sophie I. Candille et al., Science — compare eumelanin, neuromelanin

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