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sprinkler  n 
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 
sprinkler system    n 
a fire-extinguishing system that releases water from overhead pipes through nozzles opened automatically by a rise in temperature