bull wheel

noun

Definition of bull wheel

1 : the main driving wheel or gear of a machine, usually the largest and strongest wheel in the train of mechanism, in some machines (such as a shaper) transmitting the power received by the machine to the various mechanisms, in others (such as a tractor) delivering to the driving wheels the power transmitted to it from the motor
2 : a drum on which a rope is wound for hauling or lifting something (such as logs or well-boring tools)
3 : a wheel attached to the boom of a derrick at the base and used to swing the boom about a vertical axis

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“Bull wheel.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bull%20wheel. Accessed 5 Jun. 2020.

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