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a combining form appearing in loanwords from Greek, where it meant “same” (homology); on this model, used in the formation of compound words (homomorphic).
Also, especially before a vowel, hom-.
Origin of homo-
< Greek, combining form of homós one and the same; akin to Sanskrit sama-; see same Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for homo-


combining form
being the same or like: homologous, homosexual Compare hetero-
Word Origin
via Latin from Greek, from homos same
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 homo-

word-forming element meaning "same, the same, equal, like," before vowels hom-, from Greek homos "one and the same," also "belonging to two or more jointly," from PIE *somos (cf. Sanskrit samah "even, the same," Lithuanian similis "like," Gothic sama "the same," samana "together;" see same).


word-forming element meaning "homosexual," abstracted since early 20c. from homosexual, and ultimately identical to homo- (1).

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

homo- or hom-
Same; like: homotype.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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homo- in Science
A prefix meaning "same," as in homogamous, having the same kind of flower.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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