Chromophore
ahd-5
noun.
A chemical group capable of selective light absorption resulting in the coloration of certain organic compounds.
The Century Dictionary and Cyclopedia
noun.
A chromophorous substance.
the GNU version of the Collaborative International Dictionary of English
noun.
Any chemical group or residue (as NO2; N2; or O2) which imparts some decided color to the compound of which it is an ingredient.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
that part of the
molecule
of a
dye
responsible for its
colour
noun.
(more generally) the group of atoms in a molecule in which the
electronic
transition
responsible for a given
spectral
band
is located
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the chemical group that gives color to a molecule