- a pipe that conveys sewage or waste water from a toilet, etc, to a soil drain or sewer
WordReference Random House Unabridged Dictionary of American English © 2016
soil′ pipe′,
Buildinga pipe carrying wastes from toilets and sometimes from waste pipes. Cf.waste pipe (def. 2).
Etymology:1825–35
Collins Concise English Dictionary © HarperCollins Publishers::
soil pipe n
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