pinion

Short definition from Wiktionary

Noun

1. 1
   A wing.
2. 2
   The joint of a bird's wing farthest from the body.
3. 3
   Any of the outermost primary feathers on a bird's wing.
4. 4
   A moth of the genus Lithophane.
5. 5
   The smallest gear in a gear train.

Verb

1. 1
   To cut off the pinion of a bird’s wing, or otherwise disable or bind its wings, in order to prevent it from flying.
2. 2
   To bind the arms of someone, so as to deprive him of their use; to disable by so binding.
3. 3
   To restrain; to limit.

Proper noun

1. 1
   A surname.