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1 definition found
 for O2
From The Collaborative International Dictionary of English v.0.48 :

  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]

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