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)

(firearms); (intransitive) To move up and down or in and out like a piston.

A ring or seal that fits around a piston, sealing between the piston and the bore in which it slides.

a rod or bar in an engine that connects a piston to a crosshead

A pale yellow-green colour, like that of the pistachio nut.

Of a pale yellow-green colour, like that of the pistachio nut.

A deciduous tree (Pistacia vera) grown in parts of Asia for its drupaceous fruit. / The nutlike fruit of this tree. / (color) A pale green colour, like that of a pistachio seed.

plural of pistachio

(South Asia) pistachio

Any of several types of engine having cylinders containing reciprocating pistons, in which a crankshaft is turned by pistons moving up and down within cylinders.