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Wiktionary
heme

n. 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.

WordNet
heme

n. a complex red organic pigment containing iron and other atoms to which oxygen binds [syn: haem, hematin, haemitin, protoheme]

Wikipedia
Heme

Heme or haem (from Greekhaima meaning blood) is a cofactor consisting of an Fe ( ferrous) 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. Not all porphyrins contain iron, but a substantial fraction of porphyrin-containing metalloproteins have heme as their prosthetic group; these are known as hemoproteins. Hemes are most commonly recognized as components of hemoglobin, the red pigment in blood, but are also found in a number of other biologically important hemoproteins such as myoglobin, cytochrome, catalase, heme peroxidase, and endothelial nitric oxide synthase.

Usage examples of "heme".

This time it resolved itself into the angular, antlered face of Heme, the Lord of the Forest and the Wild Hunt.

Tiny twigs stuck to his head, and he looked for all the world like a miniature version of Heme in his guise as the Lord of the Forests.

The Goblin King opened his eyes, and Heme stepped up and out of his body, rivulets of dark red blood drying in the gaping wound where his antlers had been.

So was its sister planet Heme, the only other inhabited world in the system.

Worn-out hemoglobin is broken up in the liver, the heme part being split away.

The heme is made up of a squarish molecule--called a porphyrin--with an iron atom in the center.

We separated out the heme and in acid solution some of it precipitated in the form of a brilliant orange substance.

One of the things done was to isolate fresh samples of heme from The Goose, ash it and send the iron oxide to Brookhaven for isotopic analysis.

The iron from the heme of The Goose was made up only of Fe54, Fe67, and Fe58.

One known intermediate is iron-56 and the fact that auremoglobin is formed in the process leads us to suspect that the enzyme or enzymes involved may have heme as a prosthetic group.

The essential thing was to get him on oxygen as fast as possible, then hook him up to a fluid replacer, a heme carrier: he was bleeding so badly that oxygen starvation was the biggest danger.