[1] : The Collaborative International Dictionary of English v.0.48

pinion \pin"ion\, n. zool.
   a moth of the genus lithophane, as lithophane antennata,
   whose larva bores large holes in young peaches and apples.
   1913 webster
see also:
lithophane lithophane antennata 

[2] : The Collaborative International Dictionary of English v.0.48

pinion \pin"ion\, n. of. pignon a pen, f., gable, pinion in
   sense 5; cf. sp. pi~non pinion; fr. l. pinna pinnacle,
   feather, wing. see pin a peg, and cf. pen a feather,
   pennat, pennon.
   1. a feather; a quill. --shak.
      1913 webster

   2. a wing, literal or figurative.
      1913 webster

            swift on his sooty pinions flits the gnome. --pope.
      1913 webster

   3. the joint of bird's wing most remote from the body.
      --johnson.
      1913 webster

   4. a fetter for the arm. --ainsworth.
      1913 webster

   5. mech. 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.
      1913 webster

   lantern pinion. see under lantern.

   pinion wire, wire fluted longitudinally, for making the
      pinions of clocks and watches. it is formed by being drawn
      through holes of the shape required for the leaves or
      teeth of the pinions.
      1913 webster
see also:
pin pen pennat pennon rack lantern pinion 
lantern pinion wire 

[3] : The Collaborative International Dictionary of English v.0.48

pinion \pin"ion\, v. t. imp.  p. p. pinioned; p. pr.  vb.
   n. pinioning.
   1. to bind or confine the wings of; to confine by binding the
      wings. --bacon.
      1913 webster

   2. to disable by cutting off the pinion joint. --johnson.
      1913 webster

   3. to disable or restrain, as a person, by binding the arms,
      esp. by binding the arms to the body. --shak.
      1913 webster

            her elbows pinioned close upon her hips. --cowper.
      1913 webster

   4. hence, generally, to confine; to bind; to tie up.
      "pinioned up by formal rules of state." --norris.
      1913 webster
see also:
pinioned pinioning 

[4] : WordNet (r) 2.0

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
see also:
flight feather quill quill feather pennon shackle 

[5] : Moby Thesaurus II by Grady Ward, 1.0

70 moby thesaurus words for "pinion":
   anchor, appendage, arm, bind, bough, branch, bridle, chain, crest,
   enchain, entrammel, fasten, feather, fetter, gyve, hackle, hamper,
   hand, handcuff, hobble, hog-tie, hopple, imp, joint, lash, leash,
   leg, limb, link, lobe, lobule, make fast, manacle, member, moor,
   offshoot, organ, panache, peg down, picket, pin down, plume,
   plumule, put in irons, quill, ramification, restrain, rope, runner,
   scapular, scion, secure, shackle, spray, sprig, spur, straitjacket,
   strap, switch, tail, tendril, tether, tie, tie down, tie up,
   topknot, trammel, tuft, twig, wing

Pinion >> P Words
Pinion, definition of term: Pinion
pinion_pag1.html

Rack And Pinion >> R Words
Rack And Pinion, definition of term: Rack And Pinion
rack+and+pinion_pag1.html