Ni"tri*fy (?), 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.