mephitical, a. [L. mephiticus, fr. mephitis mephitis: cf. F. méphitique.].
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Tending to destroy life; poisonous; noxious; as, mephitic exhalations; mephitic regions. [1913 Webster]
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Offensive to the smell; as, mephitic odors. [1913 Webster]
Mephitic air (Chem.), carbon dioxide; -- so called because of its deadly suffocating power. See Carbonic acid, under Carbonic.