Sprinkler/ˈsprɪŋklər/ Definition 1 of 2Pro Tip 1/3Fire Safety Sprinklers in buildings are for safety and automatically activate during fires. The hotel's sprinkler system saved lives during the fire. Pro Tip 2/3Gardening Precision Garden sprinklers distribute water evenly across lawns and plants. He installed a sprinkler to get a lush green lawn. Pro Tip 3/3Efficiency Sprinklers are more efficient than manual watering, saving time and water. We use a sprinkler to water the crops efficiently.