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“mephitic”
mephitic (muh FIT ik) (adjective), more mephitic, most mephitic
A reference to something that is poisonous or foul-smelling: Exposure to mephitic exhalations should be avoided whether they are poisonous or not because they are very offensive.
Some swamps are known to give off some strong mephitic odors.
2. Etymology: from Latin mephitis; from Late Latin mephiticus, "stench, strong offensive smells; air pollution".