Description

A pinion is a round gear used in several applications: usually the smaller gear in a gear drive train, although in the case of John Blenkinsop's Salamanca, the pinion was rather large. In many cases, such as remote controlled toys, the pinion is also the drive gear.

. Define pinion: the terminal section of a bird's wing including the carpus, metacarpus, and phalanges broadly : wing — pinion in a sentence...