- (in the singular) any single facility, such as a filtration plant, within such a system
- (in the singular) the water supply system of a town etc., including reservoirs, pumps and pipes
- (informal, in the plural) the genitourinary system
- (informal, in the plural) tears
"She turned on the waterworks when we told her the old man was dead, but she was asking questions about the will soon enough."