a pinion is a form of:

Pinion



ENGLISH MEANING
noun
1.
The joint of bird's wing most remote from the body.
2.
A moth of the genus Lithophane, as L. antennata, whose larva bores large holes in young peaches and apples.
3.
A wing, literal or figurative.
4.
A fetter for the arm.
5.
A cogwheel with a small number of teeth, or leaves, adapted to engage with a larger wheel, or rack (see Rack); esp., such a wheel having its leaves formed of the substance of the arbor or spindle which is its axis.
verb
1.
(TRANSITIVE) To bind or confine the wings of; to confine by binding the wings.
2.
(TRANSITIVE) To disable by cutting off the pinion joint.
3.
(TRANSITIVE) To disable or restrain, as a person, by binding the arms, esp. by binding the arms to the body.
4.
(TRANSITIVE) Hence, generally, to confine; to bind; to tie up.
1.
A feather, a quill