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piston
Part of speech: NounA small solid cylinder, fitting exactly and moving up and down by, or working against, a fluid, as, in the barrel of a pump, or in an engine cylinder.
Usage examples "piston":- Now this machine, consisting of cylinder, piston, water, and fire, is the steam- engine in its most elementary form. - "The Art of Public Speaking", Dale Carnagey (AKA Dale Carnegie) and J. Berg Esenwein.
- His head throbbed as though there was a metal piston within beating time upon his brain. - "Servants of the Guns", Jeffery E. Jeffery.
- The Texas, trembling under the power of the reversed pressure against her piston, seemed to buck upon the tracks. - "Tom of the Raiders", Austin Bishop.