Etymology
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hemo- 
word-forming element meaning "blood," perhaps via Old French hemo-, Latin haemo-, from Greek haimo-, contraction of haimato-, combining form of haima "blood" (see -emia).
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hemato- 
also haemato-, before vowels hemat-, haemat-, word-forming element in scientific compounds meaning "blood," from Greek haimato-, combining form of haima (genitive haimatos) "blood" (see -emia). Compare hemo-.
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