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Define the word O2

"O2" gcide "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]

"o2" foldoc "The Free On-line Dictionary of Computing (27 SEP 03)"

O2
     
        Object-Oriented.  Object-oriented database language used in
        the Altair project.  Implemented as an interpreter.  GIP
        Altair, Versailles, France.  Francois Bancilhon et al, in
        Advances in Object-Oriented Database Systems, K.R. Dittrich
        ed, LNCS 334, Springer 1988.  See CO2.