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Ha He Hi Ho Hu Hy
Hem Hep Her Hes Het

Heme

/hēm/

Noun

1. A chemical compound of a type known as a prosthetic group consisting of an iron ion contained in the centre of a large heterocyclic organic ring called a porphyrin, made up of four pyrrolic groups joined together by methine bridges. (wikipedia.org)

2. The component of hemoglobin (and other hemoproteins) responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen. (wiktionary.org)

3. A complex red organic pigment containing iron and other atoms to which oxygen binds. (biology-online.org)

4. An iron-containing compound of the porphyrin class that forms the nonprotein part of hemoglobin and some other biological molecules. (Google Dictionary)

5. A family of proteins found in blood and milk and muscle and in plant seed. (wordnetweb.princeton.edu)

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