Definition

A solid cylinder that moves up and down inside a larger cylinder, often used in engines or pumps to compress or move fluids.

Example

The mechanic replaced the broken piston in the engine to restore its performance.

Conversation

Have you ever seen how a piston works in a car engine?

Yeah! It’s fascinating how it moves up and down to create power.

I read that it can also be used in pumps to move fluids.

Exactly, it’s amazing how something so simple can be so effective.

Synonyms & Antonyms

Root Explanation

**Piston** → The word 'piston' comes from Old French *piston*, which is derived from the verb *pistoner*, meaning to pound or to crush. The term refers to a cylindrical component that moves up and down within a cylinder, often used in engines to compress gases or liquids.

Memory Tip

Think of the Old French word for pounding or crushing, which helps you remember that a piston is a part that moves to compress or push substances.

Visually Confused Words