A hand tool consisting of a rotating shaft with parallel handle WordNet 3.0 & Open English WordNet

A crank is an arm attached at a right angle to a rotating shaft by which circular motion is imparted to or received from the shaft. Wikipedia

Mechanism where an arm attached to a rotating shaft by which circular motion is imparted to the shaft Wikidata

A bent piece of an axle or shaft, or an attached arm perpendicular, or nearly so, to the end of a shaft or wheel, used to impart a rotation to a wheel or other mechanical device; also used to change circular into reciprocating motion, or reciprocating into circular motion. Wiktionary

A bent piece of an axle or shaft, or an arm attached to the end of a shaft or wheel, used to impart a rotation. Wiktionary (translation)