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a combining form with the meanings “chemical,” “chemically induced,” “chemistry,” used in the formation of compound words:
Also, especially before elements of Latin origin, chemi-.
Also, especially before a vowel, chem-.
Origin of chemo-
chem-, extracted from chemical or chemistry + -o- or -i- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for chemo-


combining form
indicating that chemicals or chemical reactions are involved: chemotherapy
Word Origin
New Latin, from Late Greek khēmeia; see alchemy
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 chemo-

before vowels chem-, word-forming element denoting "relation to chemical action or chemicals," from comb. form of chemical (adj.), used to form scientific compound words from c.1900.

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

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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