Etymology
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hemoglobin (n.)

also hæmoglobin, coloring matter in red blood cells, 1862, shortening of hæmatoglobin (1845), from Greek haimato-, combining form of haima (genitive haimatos) "blood" (see -emia) + globulin, a type of simple protein, from globule, formerly a word for "corpuscle of blood."

updated on October 09, 2017

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Definitions of hemoglobin from WordNet

hemoglobin (n.)
a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues;
fish have simpler hemoglobin than mammals
Synonyms: haemoglobin / Hb
From wordnet.princeton.edu, not affiliated with etymonline.