\Me*phit"ic\, Mephitical \Me*phit"ic*al\, a. [L.
mephiticus, fr. mephitis mephitis: cf. F. m['e]phitique.]
1. Tending to destroy life; poisonous; noxious; as, mephitic
   exhalations; mephitic regions.
2. Offensive to the smell; as, mephitic odors.
{Mephitic air} (Chem.), carbon dioxide; -- so called because
   of its deadly suffocating power. See {Carbonic acid},
   under {Carbonic}.