Mephitic /(?)/

Me·phit·ic

Mephitic

a.
  1. Tending to destroy life; poisonous; noxious; as, mephitic exhalations; mephitic regions.
  2. Offensive to the smell; as, mephitic odors.

Phrases & Compounds
Mephitic air
carbon dioxide; -- so called because of its deadly suffocating power. See Carbonic acid, under Carbonic.