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mephitis

[muh-fahy-tis]
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noun
  1. (in nontechnical use) a noxious or pestilential exhalation from the earth, as poison gas.
  2. any noisome or poisonous stench.
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Origin of mephitis

1700–10; < Latin mephītis, mefītis; compare Oscan Mefit(eí) the goddess of such exhalations
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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mephitis in Medicine

mephitis

(mə-fītĭs)
n.
  1. An offensive smell; a stench.
  2. A poisonous or foul-smelling gas emitted from the earth.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.