any of various devices for sprinkling, as a watering pot, a container of water with a perforated top used to sprinkle clothes before ironing, or especially a perforated ring or small stand with a revolving nozzle to which a hose is attached for watering a lawn with a fine, even spray.
a person who sprinkles.
verb (used with object)
to provide (a warehouse, school, office building, etc.) with a sprinkler system.

1525–35; sprinkle + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sprinkler (ˈsprɪŋklə)
1.  a device perforated with small holes that is attached to a garden hose or watering can and used to spray plants, lawns, etc, with water
2.  a person or thing that sprinkles
3.  See sprinkler system

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Use your automatic sprinkler system and a mini-soaker hose to water plants that
  can endure spending time outdoors.
Many people take smoke detectors for granted and don't think about sprinkler
  systems, but a safe motel or hotel should have both.
Annie is an old dog who loves catching the rain drops from the sprinkler.
Sprinkler parks dot the city, allowing the kids to run wild.
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