porphyrin

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por·phy·rin

 (pôr′fə-rĭn)
n.
Any of various organic compounds containing four pyrrole rings, occurring universally in protoplasm, and functioning as a metal-binding cofactor in hemoglobin, chlorophyll, and certain enzymes.

[Greek porphurā, purple dye, purple garment; see purple + -in.]

porphyrin

(ˈpɔːfɪrɪn)
n
(Biochemistry) any of a group of pigments occurring widely in animal and plant tissues and having a heterocyclic structure formed from four pyrrole rings linked by four methylene groups
[C20: from Greek porphura purple, referring to its colour]

por•phy•rin

(ˈpɔr fə rɪn)

n.
a dark red, photosensitive pigment consisting of four pyrrole rings linked by single carbon atoms: a component of chlorophyll, heme, and vitamin B12.
[1905–10; < Greek porphýr(a) purple]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.porphyrin - any of various pigments distributed widely in living tissues
pigment - dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
Translations

por·phy·rin

n. porfirina, compuesto que ocurre en el protoplasma y que es la base de los pigmentos respiratorios en los animales y las plantas.