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]

The Free On-line Dictionary of Computing (30 December 2018):

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.