hemo-

1.
a combining form meaning “blood,” used in the formation of compound words:
hemocyte.
Also, hema-, hemato-; especially before a vowel, hem-; especially British, haemo-.
Origin
< Neo-Latin, combining form representing Greek haîma blood
British Dictionary definitions for hemo-

hemo-

combining form
1.
a US variant of haemo-
Word Origin and History for hemo-

word-forming element meaning "blood," perhaps via Old French hemo-, Latin haemo-, from Greek haimo-, from haima "blood" (see -emia).

hemo- in Medicine

hemo- or hema- or hem- or haemo- or haema- or haem-
pref.
Blood: hemocyte.

hemo- in Science
hemo- or hemato-  
A prefix meaning "blood," as in hemophilia, a disorder in which blood fails to clot, or hematology, the scientific study of blood.