noun (n)

• something that bulges out or is protuberant or projects from its surroundings(noun.shape)

  Example:
  The occipital protuberance was well developed.
  

  Synonym:
  bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, swelling
  

  source: wordnet30
• the condition of being protuberant; the condition of bulging out(noun.state)

  Example:
  The protuberance of his belly.
  

  source: wordnet30
• That which is protuberant swelled or pushed beyond the surrounding or adjacent surface; a swelling or tumor on the body; a prominence; a bunch or knob; an elevation.(noun)

  source: webster1913