bull wheel

noun

, Machinery.

1. any large driving gear among smaller gears.

Word History and Origins

Origin of bull wheel¹

An Americanism dating back to 1820–30

Example Sentences

The big graft in this neck-a woods is political, and the Red Tower gang is only set-a cogs in the bull-wheel.

From Project Gutenberg

It will be noted that the guys are below the bull wheel so that the boom has a clear swing through a complete circle.

From Project Gutenberg