бутало angolul

piston [pistons]▼(solid disk or cylinder that fits inside a hollow cylinder)
noun
[UK: ˈpɪ.stən] [US: ˈpɪ.stən]

plunger [plungers]▼(internal piece of syringe)
noun
[UK: ˈplʌn.dʒə(r)] [US: ˈplʌn.dʒər]