The Collaborative International Dictionary of English v.0.48:

Crossette \Cros*sette"\ (kr?s-s?t`), n. [F., dim. of crosse. See
   Crosier.] (Arch.)
   (a) A return in one of the corners of the architrave of a
       door or window; -- called also ancon, ear, elbow.
   (b) The shoulder of a joggled keystone.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Elbow \El"bow\, n. [AS. elboga, elnboga (akin to D. elleboga,
   OHG. elinbogo, G. ellbogen, ellenbogen, Icel. ?lnbogi; prop.;
   arm-bend); eln ell (orig., forearm) + boga a bending. See 1st
   Ell, and 4th Bow.]
   1. The joint or bend of the arm; the outer curve in the
      middle of the arm when bent.
      [1913 Webster]

            Her arms to the elbows naked.         --R. of
                                                  Gloucester.
      [1913 Webster]

   2. Any turn or bend like that of the elbow, in a wall,
      building, and the like; a sudden turn in a line of coast
      or course of a river; also, an angular or jointed part of
      any structure, as the raised arm of a chair or sofa, or a
      short pipe fitting, turning at an angle or bent.
      [1913 Webster]

   3. (Arch.) A sharp angle in any surface of wainscoting or
      other woodwork; the upright sides which flank any paneled
      work, as the sides of windows, where the jamb makes an
      elbow with the window back. --Gwilt.
      [1913 Webster]

   Note: Elbow is used adjectively or as part of a compound, to
         denote something shaped like, or acting like, an elbow;
         as, elbow joint; elbow tongs or elbow-tongs; elbowroom,
         elbow-room, or elbow room.
         [1913 Webster]

   At the elbow, very near; at hand.

   Elbow grease, energetic application of force in manual
      labor. [Low]

   Elbow in the hawse (Naut.), the twisting together of two
      cables by which a vessel rides at anchor, caused by
      swinging completely round once. --Totten.

   Elbow scissors (Surg.), scissors bent in the blade or shank
      for convenience in cutting. --Knight.

   Out at elbow, with coat worn through at the elbows; shabby;
      in needy circumstances.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Elbow \El"bow\, v. i.
   1. To jut into an angle; to project or to bend after the
      manner of an elbow.
      [1913 Webster]

   2. To push rudely along; to elbow one's way. "Purseproud,
      elbowing Insolence." --Grainger.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Elbow \El"bow\, v. t. [imp. & p. p. Elbowed; p. pr. & vb. n.
   Elbowing.]
   To push or hit with the elbow, as when one pushes by another.
   [1913 Webster]

         They [the Dutch] would elbow our own aldermen off the
         Royal Exchange.                          --Macaulay.
   [1913 Webster]

   To elbow one's way, to force one's way by pushing with the
      elbows; as, to elbow one's way through a crowd.
      [1913 Webster]

WordNet (r) 3.0 (2006):

elbow
    n 1: hinge joint between the forearm and upper arm and the
         corresponding joint in the forelimb of a quadruped [syn:
         elbow, elbow joint, human elbow, cubitus, cubital
         joint, articulatio cubiti]
    2: a sharp bend in a road or river
    3: a length of pipe with a sharp bend in it
    4: the part of a sleeve that covers the elbow joint; "his coat
       had patches over the elbows"
    5: the joint of a mammal or bird that corresponds to the human
       elbow
    v 1: push one's way with the elbows
    2: shove one's elbow into another person's ribs

Moby Thesaurus II by Grady Ward, 1.0:

174 Moby Thesaurus words for "elbow":
   L, angle, angle off, ankle, apex, arm, articulation, assault,
   barge in, bear, bear upon, bend, biceps, bifurcate, bifurcation,
   bight, boost, boundary, branch, break in, break in upon, buck,
   bull, bulldoze, bump, bump against, bunt, burst in, butt,
   butt against, butt in, cant, cervix, charge in, chevron, clinch,
   closure, coin, come between, connecting link, connecting rod,
   connection, corner, coupling, cram, crank, crash, crash in,
   crash the gates, creep in, crook, crotchet, crowd, crowd in,
   cut in, deflection, dig, dogleg, dovetail, drive, edge in,
   elbow in, ell, embrace, encroach, entrench, foist in, force,
   forearm, fork, furcate, furcation, gliding joint, goad, hinge,
   hinged joint, hip, hook, horn in, hurtle, hustle, impinge, impose,
   impose on, impose upon, infiltrate, inflection, infringe,
   insinuate, interface, interfere, interlope, interpose, intervene,
   intrude, invade, irrupt, jab, jam, jog, joggle, join, joining,
   joint, jolt, jostle, juncture, knee, knuckle, link, miter, mortise,
   neck, nook, nudge, obtrude, pile drive, pivot, pivot joint, point,
   poke, press, press in, prod, punch, push, push in, put on,
   put upon, quoin, rabbet, ram, ram down, rattle, run, run against,
   rush in, scarf, seam, shake, shoulder, shove, slink in, slip in,
   smash in, sneak in, squeeze in, steal in, stitch, storm in, stress,
   suture, swerve, symphysis, tamp, throng in, thrust, thrust in,
   tie rod, toggle, toggle joint, trench, trespass, union, upper arm,
   veer, vertex, weld, work in, worm in, wrist, zag, zig, zigzag