[kee-moh, kem-oh]
noun, plural chemos. Informal.
chemotherapy or a chemotherapy treatment.

by shortening; see -o Unabridged


a combining form with the meanings “chemical,” “chemically induced,” “chemistry,” used in the formation of compound words: chemotherapy.
Also, especially before elements of Latin origin, chemi-.
Also, especially before a vowel, chem-.

chem-, extracted from chemical or chemistry + -o- or -i- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chemo (ˈkiːməʊ)
informal short for chemotherapy

chemo-, (before a vowel) chemi- or (before a vowel) chem-
combining form
indicating that chemicals or chemical reactions are involved: chemotherapy
[New Latin, from Late Greek khēmeia; see alchemy]
chemi-, (before a vowel) chemi- or (before a vowel) chem-
combining form
[New Latin, from Late Greek khēmeia; see alchemy]
chem-, (before a vowel) chemi- or (before a vowel) chem-
combining form
[New Latin, from Late Greek khēmeia; see alchemy]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

comb. form of chemical, used to form scientific compound words from c.1900.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chemo che·mo (kē'mō, kěm'ō)
Chemotherapy or a chemotherapeutic treatment.

chemo- or chemi- or chem-
Chemicals; chemical: chemotherapy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Indeed, he faces the possibility of not being at all if the chemo proves
And of all patients, for the cancer patient to have to worry about whether the
  chemo drug they are receiving is counterfeit.
The seventh week of radiation after three chemo sessions, for starters.
The second protein, in turn, toggles the chemo drug to its active state.
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