pro·​tru·​sion | \ prō-ˈtrü-zhən How to pronounce protrusion (audio) \

Definition of protrusion

1 : something (such as an anatomical part or excrescence) that protrudes
2 : the act of protruding : the state of being protruded

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Choose the Right Synonym for protrusion

projection, protrusion, protuberance, bulge mean an extension beyond the normal line or surface. projection implies a jutting out especially at a sharp angle. those projections along the wall are safety hazards protrusion suggests a thrusting out so that the extension seems a deformity. the bizarre protrusions of a coral reef protuberance implies a growing or swelling out in rounded form. a skin disease marked by warty protuberances bulge suggests an expansion caused by internal pressure. bulges in the tile floor

Examples of protrusion in a Sentence

bony protrusions on the outside of the elbow a roof with many protrusions The pain was caused by a protrusion of a disc in his lower back.
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Recent Examples on the Web

They’re often designed without protrusions, bunk handles, or sprinkler heads and inmates are stripped of anything that could easily be used to cause harm, according to reporting by Slate. Riley Beggin, Vox, "Jeffrey Epstein wasn’t on suicide watch when he died. Officials want to know why.," 10 Aug. 2019 Then a protrusion — an arm, a leg, or perhaps a tentacle — pops out. Joshua Bote, USA TODAY, "Relax: That viral video of 'zombie chicken' crawling off a plate isn't chicken (probably)," 26 July 2019 What’s more, these new structures emerged when genes that help build nerve, bone, and skin tissue altered and became active in forming these bony protrusions, Qiu and colleagues report today in Science. Elizabeth Pennisi, Science | AAAS, "Cancer genes help deer antlers grow," 20 June 2019 Taurasi, who had surgery for disc protrusion in April, had been cleared to play for the Phoenix Mercury’s game against the Connecticut Sun and was in the starting lineup after missing the first 13 games. Lori Riley,, "Sun spoil Taurasi’s season debut, beat Phoenix 79-64 to snap five-game skid," 13 July 2019 The blunted nose with protrusion on top is the ASARS-2 advanced synthetic aperture radar system. Kyle Mizokami, Popular Mechanics, "Watch A U-2 Spy Plane Pilot Suit Up and Take Off on a Mission Over the Middle East," 20 Mar. 2019 The consequent protrusion, almost imperceptible to the naked eye, may help reduce the chance of a crease developing in the middle of the screen over time, one of the people said., "Samsung completes folding phone redesign after screen failures," 4 July 2019 Now, denticles, the toothlike protrusions that cover the skin of sharks, can be added to the list. Quanta Magazine, "Ancient Turing Pattern Builds Feathers, Hair — and Now, Shark Skin," 2 Jan. 2019 Hacienda staff noticed the protrusion on the women's abdomen months before, the policereport said. Bree Burkitt, azcentral, "Police report: Behavior of Hacienda nurse accused of raping patient changed in months before birth," 13 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'protrusion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of protrusion

1646, in the meaning defined at sense 2

History and Etymology for protrusion

Latin protrudere

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Statistics for protrusion

Last Updated

6 Sep 2019

Look-up Popularity

Time Traveler for protrusion

The first known use of protrusion was in 1646

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More Definitions for protrusion



English Language Learners Definition of protrusion

: a part that sticks out
: the act of sticking out or the condition of something that sticks out


pro·​tru·​sion | \ prō-ˈtrü-zhən How to pronounce protrusion (audio) \

Medical Definition of protrusion

1 : the quality or state of protruding the protrusion of a jaw
2 : something (as an anatomical part) that protrudes

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Comments on protrusion

What made you want to look up protrusion? Please tell us where you read or heard it (including the quote, if possible).


readily or continually undergoing change

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