v. t. [ imp. & p. p. Nitrified p. pr. & vb. n. Nitrifying ] [ Niter + -fy: cf. F. nitrifer. See Niter. ] (Chem.) To combine or impregnate with nitrogen; to convert, by oxidation, into nitrous or nitric acid; to subject to, or produce by, nitrification. [ 1913 Webster ]