piston ( synonym found)
Definition of piston:

(n) : a solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump); a valve device in some brass instruments for changing the pitch
Definition of piston:

(n) : a solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump); a valve device in some brass instruments for changing the pitch
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