a combining form meaning “color,” used in the formation of compound words in this sense and in the specialized sense of “chromatin”: chromatophore; chromatolysis.
Also, especially before a vowel, chromat-.

< Greek chromat-, stem of chrôma color + -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chromato- or (before a vowel) chromat-
combining form
1.  indicating colour or coloured: chromatophore
2.  indicating chromatin: chromatolysis
[from Greek khrōma, khrōmat- colour]
chromat- or (before a vowel) chromat-
combining form
[from Greek khrōma, khrōmat- colour]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

chromato- or chromat-

  1. Color: chromatophore.

  2. Chromatin: chromatolysis.

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