hematin

n.
A blue to blackish-brown compound, C₃₄H₃₂N₄O₄·FeOH, formed in the decomposition of hemoglobin.

(hē'mə-tĭn)
n.

A blue to blackish-brown compound formed in the oxidation of hemoglobin and containing ferric iron. Also called ferriheme, oxyheme, oxyhemochromogen.

A compound formed by the oxidation of heme from the ferrous Fe(II) to the ferric Fe(III) state; it does not combine with oxygen.

• h. methods — basic method of estimating hemoglobin content of blood by converting it to acid hematin and doing a colorimetric estimation. See also hemoglobinometer.

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The noun has one meaning:

Meaning #1: a complex red organic pigment containing iron and other atoms to which oxygen binds
  Synonyms: heme, haem, haemitin, protoheme

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