SPRINKLER

[noun] [C]A sprinkler is a piece of equipment for scattering water to put out fires.There was no sprinkler system (= sprinklers, fitted in a building, which automatically operate if there is a fire) in the supermarket so the fire took a hold very quickly.A sprinkler is also a device with a lot of small holes which you put on the end of a hose (= long bendable pipe used to direct water) in order to water plants, grass, etc.