What does "piston" mean?

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)

What is a synonym for "piston"?

Common synonyms include: boycock, boydick, dick, accelerator, auto, automobile.

//ˈpɪstən// name, noun, verb

name, noun, verb ·Moderate ·College level

Noun

1
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)
2
mechanical device that has a plunging or thrusting motion wordnet
3
A valve device in some brass instruments for changing the pitch

Verb

1
To move up and down or in and out like a piston. intransitive
"The Latino warrior fucked like a man possessed. His lean hips powered the pistoning rod in short, vicious jabs, so rapidly that the shit-streaked cock was a blur as it pounded Captain Randall's butthole, churning the screaming soldier's ass-juices, rectal blood, and smashed turds into a slimy froth."