Also found in: Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.
Related to protrusion: hernia


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 classic literature ?
But," said the Spectator, "you said in your famous speech before the Society for the Prevention of the Protrusion of Nail Heads from Plank Sidewalks that Kings were blood-smeared oppressors and hell- bound loafers.
they deified the crocodile of the nile, because the crocodile is tongueless; and the Sperm Whale has no tongue, or as least it is so exceedingly small, as to be incapable of protrusion.
She could not reconcile the anxieties of a spiritual life involving eternal consequences, with a keen interest in gimp and artificial protrusions of drapery.
The objective of this study was to see the effect of lip morphology in the study sample presenting with bimaxillary dentoalveolar protrusion on normal skeletal pattern.
That's why it's very important mortar crews regularly check the protrusion of the firing pin as part of their BEFORE PMCS.
And there were reports of some of these old guns being ruined by incorrect reassembly, resulting in firing pin protrusion.
A tubular protrusion extends upwardly from the upper surface of the crotch region and is sized and positioned in a transversely middle zone of the crotch region for surrounding at least one of an anus and a urethral orifice of the wearer.
I have a protrusion on the top part of my left wrist.
Key statement: An aircraft tire capable of suppressing rubber tire wear during landing and shocks which accelerate or decelerate an aircraft at touchdown includes, on a side of a tire body constituting an outer peripheral part of an aircraft wheel, a protrusion for receiving flight wind pressure.
Globe protrusion measured by MDCT (globe protrusion, GPR) was correlated to Hertel measured protrusion (HR).
Intravesical Prostatic Protrusion (IVPP) is represented as a severe parameter of the Bladder Outlet Obstruction (BOO) due to Benign Prostatic Hypertrophy (BPH) traditionally and it is considered based on the experience that it can be cured only by surgical management.