An externally operated valve regulating the flow of a liquid inside a pipe.
Depending what is wrong with it and what type of main stopcock you have, it may need to be serviced or replaced.
It is more normal to shut off the water supply at the suppliers stopcock (at the edge of your property near the road) when you need to do this. If you can not find the main stopcock to do this, contact your supplier. If you must resort to freezing the mains before your stopcock, you need to get a qualified plumber to do this for you.
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If your stopcock on your car's radiator is seized you will probably damage it and ruin the radiator if you try to force it. Leave it alone and drain the water through the lower radiator hose. There is little to gain and a lot to risk in trying to get it to work.
Spout, spigot, nozzle, outlet, stopcock, valve, tap
A buret is a glass tube with fine gradations and a stopcock at the bottom, used in laboratory procedures.
To remove the air bubbles, open the stopcock and the air bubbles will remove
6/7 litres usually but you can change that by altering the stopcock level.
it is a valve made of glass often used in laboratory glasswares such as separatory funnels, burets, etc.
A burette is a glass tube with fine gradations and a stopcock at the bottom, used in laboratory procedures for accurate fluid dispensing and titration.
3 Way stop cock is designed to provide an additional infusion opportunity between Line and Venipuncture.
The type of laboratory glassware that is used to transfer fluids is a dropping funnel. To allow the flow of the fluid to be controlled, they are fitted with a stopcock.