stopcock
nounUK /ˈstɒp.kɒk/
US /ˈstɑːp.kɑːk/
A stopcock is a small tap that turns the water or gas on and off.
The plumber turned the stopcock to shut off the water before fixing the leak.
RELATED WORDS
OTHER MEANINGS
2. A small valve used in laboratory glassware to control the flow of liquids or gases.
She opened the stopcock on the burette to let the solution drip slowly.
3. A device for draining liquid from a container or machine.
He opened the stopcock at the bottom of the radiator to drain the water.
4. A tap on a cask or barrel for drawing off liquid.
The bartender turned the stopcock on the barrel to pour a glass of ale.