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1. Having the same color or wavelength. Used of light.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a. having the same colour
b. of uniform colour
2. (Photography) photog (of an early type of emulsion) sensitive to green light in addition to blue light but not to red light
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
i•so•chro•mat•ic(ˌaɪ soʊ krəˈmæt ɪk)
1. having the same color or tint.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.