The Collaborative International Dictionary
Hemo-
Hemo- \Hem"o-\ Same as H[ae]ma-, H[ae]mo-.
Douglas Harper's Etymology Dictionary
hemo-
word-forming element meaning "blood," perhaps via Old French hemo-, Latin haemo-, from Greek haimo-, from haima "blood" (see -emia).
Wiktionary
hemo-
pre. (alternative spelling of haemo- English)