porphyrin

porphyrin

[pawr-fuh-rin]
noun Biochemistry.
a dark red, photosensitive pigment consisting of four pyrrole rings linked by single carbon atoms: a component of chlorophyll, heme, and vitamin B 1 2 .

Origin:
1905–10; < Greek porphýr(a) purple + -in2

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World English Dictionary
porphyrin (ˈpɔːfɪrɪn)
 
n
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]

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Medical Dictionary

porphyrin por·phy·rin (pôr'fə-rĭn)
n.
Any of various heterocyclic compounds, derived from pyrrole, that occur universally in protoplasm, contain a central metal atom, and provide the foundation structure for hemoglobin, chlorophyll, and certain enzymes.

The American Heritage® Stedman's Medical Dictionary
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Science Dictionary
porphyrin   (pôr'fə-rĭn)  Pronunciation Key 
Any of various organic pigments containing four pyrrole rings bonded to one another. The rings form the corners of a large flat square, in the middle of which is a cavity that often contains a metal atom. Porphyrins occur universally in protoplasm and function with bound metals such as iron in hemoglobin and magnesium in chlorophyll.
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