the principal shaft of a motor, transmission, etc. (distinguished from jackshaft).
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Question 1 of 7
This tall, horizontally branched cactus is probably the most recognizable cactus in Arizona. What is it called?
Words nearby main shaft
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for main shaft
A is the pump; B the eccentric on main-shaft to work it by steam power.How to Become an Engineer|Frank W. Doughty