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a. The act of protruding.
b. The state of being protruded.
2. Something that protrudes.

[Latin prōtrūsus, past participle of prōtrūdere, to protrude; see protrude + -ion.]


1. something that protrudes
2. the state or condition of being protruded
3. the act or process of protruding


(proʊˈtru ʒən, prə-)

1. the act of protruding or the state of being protruded.
2. something that protrudes; projection.
[1640–50; < Latin prōtrūs(us) (past participle of prōtrūdere to protrude) + -ion]




  1. Bulges out like bubble gum before popping —Tom Robbins
  2. Protruding like a warning finger —Beryl Markham
  3. [A church spire] standing out conspicuously like an indicating finger —MacDonald Harris
  4. Standing out unnaturally, like a male harpist in an all-girl orchestra —William Safire
  5. Stand out like a blind man at a tit show —William Diehl
  6. Stand out like a polar bear in the desert —Andrew Kaplan
  7. Stand out like a raisin on a coconut cake —Pat Conroy
  8. Stands out like a blackberry in a pan of milk —American colloquialism, attributed to Vermont
  9. Stick out like a bug on a butter knife —Loren D. Estleman
  10. Sticks out like the belly of a pregnant woman —Robert Lowell
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.protrusion - something that bulges out or is protuberant or projects from its surroundingsprotrusion - something that bulges out or is protuberant or projects from its surroundings; "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"
frontal eminence - either prominence of the frontal bone above each orbit
occipital protuberance - prominence on the outer surface of the occipital bone
belly - a part that bulges deeply; "the belly of a sail"
caput - a headlike protuberance on an organ or structure; "the caput humeri is the head of the humerus which fits into a cavity in the scapula"
mogul - a bump on a ski slope
nub, nubble - a small lump or protuberance
snag - a sharp protuberance
wart - any small rounded protuberance (as on certain plants or animals)
projection - any solid convex shape that juts out from something
2.protrusion - the act of projecting out from something
change of shape - an action that changes the shape of something


noun protuberance, swelling, lump, bump, projection, bulge, hump, jut, outgrowth an ugly protrusion on the ankle where the bone had not set properly


A part that protrudes or extends outward:


[prəˈtruːʒən] Nsaliente m, protuberancia f


(= protruding object)Vorsprung m
(= protruding) (of rock, buttress, teeth etc)Vorstehen nt; (of forehead, chin)Vorspringen nt; (of eyes)Vortreten nt
References in periodicals archive ?
The decision was to fabricate five-unit implant-supported FPD in anterior segment due to excessive maxillary protrusion. A bar and three ball attachments were used in the maxillary posterior segment.
The most common combinations are maxillary protrusion with normal mandible, mandibular retrusion with normal maxilla, maxillary protrusion combined with mandibular retrusion and posterior rotation of the mandible.
It was determined that the frequency ranges from 64% for mandibular retrusion, 19% for maxillary protrusion and 17% for mixta.