mephitical

me=phit=i=cal

CIDE DICTIONARY

mephitical, a. [L. mephiticus, fr. mephitis mephitis: cf. F. méphitique.].

Tending to destroy life; poisonous; noxious; as, mephitic exhalations; mephitic regions. [1913 Webster]
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.