Definition of hemoglobin in English:

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Pronunciation: /ˈhēməˌɡlōbən/
(British haemoglobin)


A red protein responsible for transporting oxygen in the blood of vertebrates. Its molecule comprises four subunits, each containing an iron atom bound to a heme group.
Example sentences
  • The key, she believes, may be the iron content of the blood and muscle proteins hemoglobin and myoglobin.
  • The main task of red blood cells is to transport oxygen bound to haemoglobin from the lungs to the tissues.
  • The red blood cells carry red blood protein called haemoglobin.


Mid 19th century: a contracted form of hematoglobulin, in the same sense.

For editors and proofreaders

Syllabification: he·mo·glo·bin

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