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sprinkler system

  1. a system of pipes and attached nozzles carrying water or other extinguishing fluid throughout a building for protection against fire: it usually operates automatically when exposed to abnormal heat
  2. a system of pipes and nozzles, often underground, for watering a lawn, golf course, etc.

See sprinkler system in American Heritage Dictionary 4

noun
A fire-extinguishing system consisting of a network of overhead pipes that release water automatically when a predetermined temperature has been reached.
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