from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a pipe to drain or let off water

from the GNU version of the Collaborative International Dictionary of English

  • n. A pipe to let off water.

from The Century Dictionary and Cyclopedia

  • n. A pipe laid at the level of the bottom of a canal for letting off the water.


From off- +‎ let (Wiktionary)


  • First, the water might be run off by a descending pipe, if an offlet could be got at the depth of thirty-five or thirty-six feet, and any air might be extracted by a small pump.

    James Watt


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