O2

O2
Chromophore Chro"mo*phore, n. [Gr. ? color + fe`rein to bear.] (Chem.) Any chemical group or residue (as {NO2}; {N2}; or {O2}) which imparts some decided color to the compound of which it is an ingredient. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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