Demephitize \De*meph"i*tize\, v. t. [imp. & p. p. {Demephitized}; p. pr. & vb. n. {Demephitizing}.] [Cf. F. m['e]phitiser to infect with mephitis.] To purify from mephitic or foul air. -- {De*meph`i*ti*za"tion}, n. [1913 Webster]