- The definition of a piston is a sliding valve that is snugly fitted into a cylinder in an engine and which moves up and down because of pressure, or a sliding valve in the cylinder of a brass instrument.
- An example of a piston is the part of a car that compresses fluids and creates fluid pressure.
- An example of a piston is the valve in a trumpet that changes the notes played by pushing down on one of three pistons.
- the snug-fitting engine part that is forced back and forth within a cylinder by the pressure of combustion, steam, etc. and a reciprocating connecting rod
- Music a sliding valve moved in the cylinder of a brass instrument to change the pitch
Origin of pistonFrench ; from Italian pistone ; from pistare, to pound, crush ; from Late Latin frequentative of Classical Latin pinsere, to pound, beat: see pestle
Piston, Walter 1894-1976; U.S. composer
- A solid cylinder or disk that fits snugly into a larger cylinder and moves under fluid pressure, as in a reciprocating engine, or displaces or compresses fluids, as in pumps and compressors.
- Music A valve mechanism in brass instruments for altering the pitch.
Origin of pistonFrench, from Italian pistone, pestone, large pestle, from pestare, to pound, crush, from Late Latin pistāre, frequentative of Latin pīnsere, pīnsāre.
in an internal-combustion engine
From French piston.