pinion

A small wheel with cogs or teeth which engage the teeth of a larger wheel with cogs or teeth, or sometimes only an arbor or spindle having notches or leaves, which are caught successively by the teeth of the wheel, and the motion thereby communicated. See also cut under pawl-press.

Same as piñon.

To bind or confine the wings of (a bird); restrain or confine by binding the wings, or by cutting off the pinions; bind or confine (the wings).

To bind or confine the arm or arms of (a person) to the body so as to disable or render incapable of resistance; shackle.

To bind; attach as by bonds or shackles.

A feather; especially, a remex or flight-feather.

The wing of a bird, or the flight-feathers collectively.

Technically, in ornithology, the joint of a bird’s wing furthest from the body; the distal segment of the wing; the manus, consisting of the carpus, metacarpus, and phalanges, collectively bearing the primary remiges, or largest flight-feathers, and the alula or bastard-wing.

In entomology, one of various moths: as, the brown-spot pinion, Anchocelis litura.

[⟨ pinion, verb] A shackle or band for the arm.