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-.

< Greek, combining form of homós one and the same; akin to Sanskrit sama-; see same

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World English Dictionary
combining form
Compare hetero- being the same or like: homologous; homosexual
[via Latin from Greek, from homos same]

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Word Origin & History

"the same," prefix commonly used to form modern words, from Gk. homos "one and the same," also "belonging to two or more jointly," from PIE *somos (cf. Skt. samah "even, the same;" Lith. similis "like," Goth. sama "the same," samana "together;" see same).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
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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