Century Dictionary and Cyclopedia
- n draintrap A contrivance to prevent the escape of foul air from drains, while allowing the passage of water into them. Drain-traps are of various forms. In those represented in the cuts it will be seen that there must always be a certain quantity of water maintained to bar the way against the escape of the gas from the drain or sewer. When additional liquid is conveyed to the trap, there is of course an overflow into the drain. In the left-hand figure the gas is prevented from escaping by a metal plate thrown obliquely over the drain-mouth and dipping into the water in the vessel beyond it.