from The Century Dictionary.
- noun A contrivance to prevent the escape of foul air from drains, while allowing the passage of water into them.
from the GNU version of the Collaborative International Dictionary of English.
- noun See 4th
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A bend, sag, or other device in a waste-pipe arranged so that the liquid contents form a seal which prevents the escape of noxious gases, but permits the flow of liquids.
from Wiktionary, Creative Commons Attribution/Share-Alike License
drain + trap
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