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a combining form meaning “blood,” used in the formation of compound words:
Also, hema-, hemato-; especially before a vowel, hem-; especially British, haemo-.
Origin of hemo-
< New Latin, combining form representing Greek haîma blood Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for hemo-


combining form
a US variant of haemo-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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).

Online Etymology Dictionary, © 2010 Douglas Harper
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hemo- in Medicine

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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