a combining form meaning “color,” used in the formation of compound words: chromhydrosis.
a combining form used in the names of chemical compounds in which chromium is present.
a combining form that, when prefixed to the name of a chemical compound, denotes its colored form.
Also, -chrome; especially before a consonant, chromo-.

def. 1, for Greek chrôma color (see chroma); def. 2, for chromium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chromo- or (before a vowel) chrom-
combining form
1.  indicating colour, coloured, or pigment: chromogen
2.  indicating chromium: chromyl
[from Greek khrōma colour]
chrom- or (before a vowel) chrom-
combining form
[from Greek khrōma colour]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

chrom- pref.
Variant of chromo-.

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