1. having a foul, offensive, or noxious smell
Usage: formal
2. poisonous or harmful to breathe
Usage: formal; technical

Examples

• The mephitic gases rising from the swamp made it difficult to breathe.
• Workers avoided the mephitic fumes coming from the chemical plant.
• The cave was filled with mephitic air that drove the explorers back.
• A mephitic odor emanated from the abandoned building.
• The mephitic vapors from the landfill could be detected miles away.
• Scientists warned about the mephitic emissions from the volcano.