ˈwȯ]d.ərə(r), ˈwä], ]tər-\ noun
( -s )
: one that waters (as crops, soil, coal, or roadways): as
a. : a person who obtains or supplies drinking water
helping out as a waterer of horses and cleaner of stables
b. : a device used for supplying water to livestock and especially poultry and often equipped with an automatic float valve