[kroh-muh-juh n, -jen]
  1. Chemistry.
    1. any substance found in organic fluids that forms colored compounds when oxidized.
    2. a colored compound that, though not a dye itself, can be converted into a dye.
  2. a chromogenic bacterium.

Origin of chromogen

First recorded in 1855–60; chromo- + -gen Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for chromogen

Historical Examples of chromogen

British Dictionary definitions for chromogen


  1. a compound that forms coloured compounds on oxidation
  2. a substance that can be converted to a dye
  3. a bacterium that produces a pigment
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

chromogen in Medicine


  1. A substance that lacks definite color but may be transformed into a pigment.
  2. A strongly pigment-generating or pigmented organelle, organ, or microorganism.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.