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From The Collaborative International Dictionary of English v.0.48:
Oxonic \Ox*on"ic\, a. [Prob. glyoxalic + carbonic.] (Chem.) Pertaining to, or designating, a complex nitrogenous acid (C4H5N3O4) not known in the free state, but obtained, in combination with its salts, by a slow oxidation of uric acid, to which it is related. [1913 Webster]