Definitions

1. noun

a rod with a series of lobes or cranks that converts reciprocating motion into rotary motion, used to transmit power in internal combustion engines and other machinery

“The mechanic carefully inspected the crankshaft for any signs of wear and tear.”

2. noun

a rod with a series of lobes or cranks that converts rotary motion into reciprocating motion, used in some types of machinery

“The crankshaft in the old steam engine was a marvel of engineering.”