trunnion.

A projecting pin or cylindrical support that lets a component pivot in a bearing.

Use it for

Words that belong together

• a trunnion bearing
• a barrel trunnion

On the page

The trunnion bearing held the barrel while the elevation mechanism moved.

Cracks near the trunnion forced them to lower the assembly before repair.

Usage notes

Primary category: sci-fi. Forms: Singular trunnion; plural trunnions. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.