noun Chemistry.
any radical or group of atoms that intensifies the color of a substance.

1890–95; auxo- + chrome

auxochromic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
auxochrome (ˈɔːksəˌkrəʊm)
a group of atoms that can be attached to a chromogen to convert it into a dye

Collins English Dictionary - Complete & Unabridged 10th Edition
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