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sprinkler system

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noun
  1. apparatus for automatically extinguishing fires in a building, consisting of a system of water pipes in or below the ceilings, with valves or sprinklers usually made to open automatically at a certain temperature.
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Origin of sprinkler system

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sprinkler system

sprinkler system

noun
  1. a fire-extinguishing system that releases water from overhead pipes through nozzles (sprinklers) opened automatically by a rise in temperature
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012