/ Dictionary / Index M mephitis: Meaning and Definition of Find definitions for: me•phi•tis Pronunciation: (mu-fī'tis), [key] — n. (in nontechnical use) a noxious or pestilential exhalation from the earth, as poison gas. any noisome or poisonous stench. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mephitis (Thesaurus) mephitic meprobamate Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language