protrusion

from WordNet (r) 3.0 (2006)

protrusion
    n 1: something that bulges out or is protuberant or projects
         from its surroundings; "the gun in his pocket made an
         obvious bulge"; "the hump of a camel"; "he stood on the
         rocky prominence"; "the occipital protuberance was well
         developed"; "the bony excrescence between its horns" [syn:
         {bulge}, {bump}, {hump}, {swelling}, {gibbosity},
         {gibbousness}, {jut}, {prominence}, {protuberance},
         {protrusion}, {extrusion}, {excrescence}]
    2: the act of projecting out from something [syn: {protrusion},
       {projection}, {jut}, {jutting}]

from The Collaborative International Dictionary of English v.0.48

Protrusion \Pro*tru"sion\, n.
   1. The act of protruding or thrusting forward, or beyond the
      usual limit.
      [1913 Webster]

   2. The state of being protruded, or thrust forward.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

29 Moby Thesaurus words for "protrusion":
      bas-relief, bellying, boldness, bulge, bulging, bump, embossment,
      eminence, excrescence, excrescency, extrusion, gibbosity,
      gibbousness, high relief, jut, knob, low relief, lump, projection,
      prominence, protuberance, protuberancy, relief, salience, salient,
      swelling, tuberosity, tuberousness, tumescence