noun (n)

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

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

  source: wordnet30
• squeezing out by applying pressure(noun.act)

  Example:
  An unexpected extrusion of toothpaste from the bottom of the tube.
  

  Synonym:
  expulsion
  

  source: wordnet30
• The act of thrusting or pushing out; a driving out; expulsion.(noun)

  source: webster1913