pinion
     n 1: a gear with a small number of teeth designed to mesh with a
          larger wheel or rack
     2: any of the larger wing or tail feathers of a bird [syn: {flight
        feather}, {quill}, {quill feather}]
     3: wing of a bird [syn: {pennon}]
     v 1: bind the arms of [syn: {shackle}]
     2: cut the wings off (of birds)
Source: WordNet® 2.0