Definitions for haem
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Princeton's WordNet
heme, haem, hematin, haemitin, protoheme(noun)
a complex red organic pigment containing iron and other atoms to which oxygen binds
Wiktionary
haem(Noun)
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.
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