Anything that sticks or juts out from a surface is a protrusion. When you're rock climbing, every protrusion is a possible handle to grab or step to stand on.

In medicine, most protrusions are evidence of some disorder or illness, like a bulging protrusion in your belly. Most other protrusions, though, are perfectly normal: your nose is a protrusion in the middle of your face, and a spire can be described as a protrusion on the top of a church. The Latin source of protrusion is protrudere, "to push out."

Definitions of protrusion
  1. noun
    something that bulges out or is protuberant or projects from its surroundings
    synonyms: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protuberance, swelling
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    frontal eminence
    either prominence of the frontal bone above each orbit
    occipital protuberance
    prominence on the outer surface of the occipital bone
    a part that bulges deeply
    a headlike protuberance on an organ or structure
    a bump on a ski slope
    nub, nubble
    a small lump or protuberance
    a sharp protuberance
    any small rounded protuberance (as on certain plants or animals)
    type of:
    any solid convex shape that juts out from something
  2. noun
    the act of projecting out from something
    synonyms: jut, jutting, projection
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    type of:
    change of shape
    an action that changes the shape of something
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