Oxygenate \Ox"y*gen*ate\, v. t. [imp. & p. p. {Oxygenated}; p. pr. & vb. n. {Oxygenating}.] [Cf. F. oxyg['e]ner.] (Chem.) To unite, or cause to combine, with oxygen; to treat with oxygen; to oxidize; as, oxygenated water (hydrogen dioxide). [1913 Webster]