Definition of haem in English:

haem

Line breaks: haem
Pronunciation: /hiːm
 
/
(US heme)

noun

[mass noun] Biochemistry
  • An iron-containing compound of the porphyrin class which forms the non-protein part of haemoglobin and some other biological molecules.
    More example sentences
    • This turnover releases significant amounts of the iron-free portion of heme, porphyrin, which is subsequently degraded.
    • The majority of photosensitizers are derivatives of hematoporphyrin, a synthetic porphyrin synthesized from heme.
    • The active site or prosthetic group of all the cytochromes is an iron containing porphyrin, or heme.

Origin

1920s: back-formation from haemoglobin.

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