[syn: protrusion, projection, jut, jutting]
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]
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]
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