Pronunciation: (pin'yun),[key] —n. 1. Mach. a. a gear with a small number of teeth, esp. one engaging with a rack or larger gear. See diag. under rack1.
b. a shaft or spindle cut with teeth engaging with a gear.
2. Metalworking.a gear driving a roll in a rolling mill.
Pronunciation: (pin'yun),[key] —n. 1. the distal or terminal segment of the wing of a bird consisting of the carpus, metacarpus, and phalanges.
2. the wing of a bird.
3. a feather.
4. the flight feathers collectively.
—v.t. 1. to cut off the pinion of (a wing) or bind (the wings), as in order to prevent a bird from flying.
2. to disable or restrain (a bird) in such a manner.
3. to bind (a person's arms or hands) so they cannot be used.
4. to disable (someone) in such a manner; shackle.
5. to bind or hold fast, as to a thing: to be pinioned to one's bad habits.