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

n something that bulges out or is protuberant or projects from its surroundings

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

n the act of projecting out from something

jut, jutting, projection
Type of:
change of shape
an action that changes the shape of something

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