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Definition of piston:

  1. A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes.

Synonyms:

plunger, diver, disk, Walter Piston, device, ram, plumber's helper, speculator, sucker.

Usage examples: