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Definition of haemoglobin noun from the Oxford Advanced Learner's Dictionary

 

haemoglobin

 noun
(British English) (North American English hemoglobin) noun
BrE BrE//ˌhiːməˈɡləʊbɪn//
 
; NAmE NAmE//ˌhiːməˈɡloʊbɪn//
 
[uncountable]
 
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a red substance in the blood that carries oxygen and contains iron Word Origin mid 19th cent.: a contracted form of haematoglobulin, in the same sense.