'O2' definitions:
Definition of '
O2
'
From:
GCIDE
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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