ˈ ̷ ̷ ̷ ̷+ˌfō(ə)r noun
( -s )
Etymology: International Scientific Vocabulary chrom- + -phore; originally formed as German chromophor
: a functional group (as nitroso, nitro, azo, or the conjugated unsaturated grouping of quinone) that gives rise to color in a molecule and that with the assistance of an auxochrome (as a hydroxyl or amino group) produces a dye