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air trap[′er ‚trap]
A U-shaped pipe filled with water that prevents the escape of foul air or gas from such systems as drains and sewers.
A U-shaped pipe filled with water and located beneath plumbing fixtures to form a seal against the passage of gas and odors.
1. A device to maintain a water seal against sewer gases, air, and odors; also called a stench trap.
2. A removable section of a theater stage floor.
3. Same as traprock.