What is the meaning of protrusion?

noun

• Something that bulges out or is protuberant or projects from its surroundings.
  • usage: "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"
  • synonyms: bulge, bump, hump, swelling, gibbosity, gibbousness, jut, prominence, protuberance, extrusion, excrescence
• The act of projecting out from something.
  • synonyms: projection, jut, jutting