The Collaborative International Dictionary
Soil \Soil\, n. [OE. soile, F. sol, fr. L. solum bottom, soil; but the word has probably been influenced in form by soil a miry place. Cf. Saloon, Soil a miry place, Sole of the foot.]
The upper stratum of the earth; the mold, or that compound substance which furnishes nutriment to plants, or which is particularly adapted to support and nourish them.
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Land; country.
Must I thus leave thee, Paradise? thus leave Thee, native soil?
--Milton. -
Dung; f[ae]ces; compost; manure; as, night soil.
Improve land by dung and other sort of soils.
--Mortimer.Soil pipe, a pipe or drain for carrying off night soil.
Soil pipe \Soil pipe\ A pipe or drain for carrying off night soil.
Wiktionary
n. A pipe that carries off liquid wastes from a toilet
WordNet
n. drain that conveys liquid waste from toilets, etc.
Usage examples of "soil pipe".
Getting back to toilets, you do have a problem if your John is at ground level or in the basement -- that is, where the soil pipe runs horizontally or at a very shallow angle to the sewer.
Rats are good underwater swimmers, and it's no problem -- believe it or not, they actually have movies of this -- for rats to stroll along a horizontal soil pipe from the sewer, swim through the water-filled piping inside the toilet, and emerge in the toilet bowl.
If the soil pipe runs vertically for five or six feet or more, though, you're probably safe.
Working my shoulders to ease the stiffness, I can make out no sound but the heater's tick until a torrent of water drops through a soil pipe nearby as a toilet is flushed overhead.