truck
A small wheel or roller, specifically the wheel of a gun carriage.
Other meanings
The ball on top of a flagpole.
On a wooden mast, a circular disc (or sometimes a rectangle) of wood near or at the top of the mast, usually with holes or sheaves to reeve signal halyards
Example sentences
Word history
From Ancient Greek "τροχός".
Where this comes from
This definition is adapted from “truck” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.