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Answer for the clue "One of two matching colors with different spectra ", 7 letters:
metamer

Word definitions for metamer in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) Either of a number of molecules that mutually exhibit metamerism.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Metamer \Met"a*mer\, n. [See Metamere .] (Chem.) Any one of several metameric forms of the same substance, or of different substances having the same composition; as, xylene has three metamers, viz., orthoxylene, metaxylene, and paraxylene; an isomer.