noun.
A poisonous or foul-smelling gas emitted from the earth.
The Century Dictionary and Cyclopedia
noun.
A pestilential exhalation, especially from the earth; any noxious or ill-smelling emanation, as from putrid or filthy substances; a noisome or poisonous stench.
noun.
[capitalized] [NL.] A genus of skunks, typical of the subfamily Mephitinæ.
the GNU version of the Collaborative International Dictionary of English
noun.
Noxious, pestilential, or foul exhalations from decomposing substances, filth, or other source.