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Wiktionary

haem

alt. The component of haemoglobin 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. n. The component of haemoglobin 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

haem

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