Pinion

              Pinion [PIN-yuh'n]

                [noun, transitive verb ]

                MEANING :

            1. (n.) a cogwheel or gear with teeth, used with or connecting with a rack or larger gear

2. (n.) the wing of a bird or its flight feathers

3. (n.) the terminal segment of a bird's wing

4. (tr. v.) to bind or cut off the terminal segment of the bird's wing

5. (tr. v.) to restrain by binding or to shackle

              

  USAGE EXAMPLE 1:

 The mechanic got the old grinding mill to start working by replacing the pinion and ring gear and overhauling the entire machinery.