pinion

A small gear wheel designed to mesh with a larger gear or rack.

"The motor drives a small pinion."

To cut off the pinion of a bird to prevent it from flying.

"The zookeeper pinioned the swan."

To tie or hold someone's arms or legs tightly, preventing movement.

"They pinioned his arms behind his back."

The outer joint of a bird's wing, including the flight feathers.

"The falcon had a damaged pinion."