A protuberance is something that sticks out, like a swelling or a lump or a bunion on your foot. A protuberance doesn’t have to be hideous; it could be your nose on your face or a knot on a tree.

The late Latin word prōtūberāre meant "to swell," coming from the prefix pro, which means "forward," and the root word tūber, meaning "swelling." And "root word" is appropriate here, since a tuber is a thick, fleshy part of a root, like a potato. And that should help you remember how to spell the word protuberance. Don't you love it when a word's meaning and its spelling work together?

Definitions of protuberance

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

“the occipital protuberance was well developed”
bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, swelling
show 8 types...
hide 8 types...
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 condition of being protuberant; the condition of bulging out

“the protuberance of his belly”
Type of:
condition, status
a state at a particular time

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, can put you on the path to systematic vocabulary improvement.