haemoglobin /ˌhiːməˈɡləʊbɪn 
/ (US English hemoglobin) ▸ noun [mass noun] Biochemistry 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 haem group. – ORIGIN mid 19th century: a contracted form of haematoglobulin, in the same sense.
EnglishOxford Dictionary of English
