The case or housing of a pump; a case enclosing the valve of a pump. Also: the piston of a simple reciprocating pump. Cf. earlier pump box, n.

The piston of a pump.

Something resembling a shoe (sense 1 or 4) in shape, position, or function. The piston (of a pump). Obsolete. rare.

The plunger of a force-pump. Obsolete.

In various machines, esp. mills: (a part of) a mechanical device which pounds, stamps, presses, or grinds; a pounder or stamper. Formerly also…

The piston of an ordinary lift-pump.

An instrument or means for forcing. The plunger or piston of a force-pump.

In various technical contexts. The piston or plunger of a pump. Obsolete.

A similar instrument used for various purposes, as exhausting or compressing air, squirting water over plants, etc.: see quots.

Any of various other tools or machines with a similar action, as (a) a steam hammer used in shaping a mass of puddled iron before rolling; (b) the…