(pin′yən) noun
1. The wing of a bird.
2. A feather; a quill.
3. The outer segment of a bird's wing, bearing the flight feathers.
4. The anterior border of the wing of an insect.
—v.t.
1. To cut off one pinion or bind the wings of (a bird) so as to prevent flight.
2. To cut or bind (the wings) of a bird.
3. To bind or hold the arms of (someone) so as to render helpless.
4. To shackle; confine. [<OF pignon a streamer, a feather <L penna, pinna a feather]
—pin′ioned adjective

(pin′yən) noun Mech.
A toothed wheel (or sometimes, in watches, a ribbed wire) driving or driven by a larger cogwheel. [<F pignon, orig. a battlement <OF pinun <L pinna, orig. a pinnacle]