demephitize

v. t.

[imp. & p. p. Demephitized ; p. pr. & vb. n. Demephitizing.]
[Cf. F. méphitiser to infect with mephitis.]
To purify from mephitic or foul air. -- De·meph·i·ti·za·tion, n.

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[fr. de- + mephit-ic + -ize] rare 'To purify from foul unwholesome air' {Webster 1828}
hence, demephitization