Definition

A small cylindrical part that allows something to rotate or pivot, often used in machinery or on cannons.

Example

The engineer adjusted the trunnion to ensure the cannon could pivot smoothly.

Conversation

Did you ever notice how the cannon pivots on its trunnion at the museum?

Yeah, it's pretty cool how that works!

I find it fascinating how something so small can be so important to its function.

Absolutely! Without the trunnion, it wouldn't be able to aim properly.

Synonyms & Antonyms

Root Explanation

Trunnion originates from the French word 'tronçon' (meaning a piece or section), which is derived from 'tronquer' (meaning to cut off). The word refers to a cylindrical protrusion used as a pivot or support, particularly in machinery and artillery.

Memory Tip

Think of a 'piece' or 'section' ('tronçon') that acts as a support or pivot in machinery — that's what a trunnion does.

Visually Confused Words