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 The Pfizer vaccine targets the spike protein, the knobby protrusion on the SARS-CoV-2 virus that allows the virus to attach to and invade human cells, initiating infection. Helen Branswell, STAT, "Four reasons for encouragement based on Pfizer’s Covid-19 vaccine results," 9 Nov. 2020 In the machine here represented that hold on the ground is secured by the protrusion of a series of twelve anchors through the rim of each wheel. Dan Schlenoff, Scientific American, "50, 100 & 150 Years Ago: November 2020," 20 Oct. 2020 She was diagnosed with degenerative disc disease and had disc protrusion in multiple cervical joints. Amy Wray And Rachael Scott, CNN, "Gold medalist Laura Wilkinson attempts Olympic comeback after nearly a decade in retirement," 3 Oct. 2020 Remove each protrusion with sandpaper or a sharp wood chisel. Joseph Truini, Popular Mechanics, "What Is MDF, and Is It Right for Your Next Project?," 7 Oct. 2020 When looking at your own ankle, it’s that rounded bony protrusion that sticks out a little bit above your shoe. Colin Hoobler, oregonlive, "Colin Hoobler: Zach Collins’ stress fracture recovery could take months, poses high risk of re-injury for Trail Blazers’ center," 24 Aug. 2020 Sure enough, the doctor explained that the protrusion on her neck was the result of a cancerous tumor pressing on her thyroid. Claudia Harmata,, "TV Reporter Who Learned She Had Cancer Thanks to Viewer Says She’s Nearly Back to Her 'New Normal’," 4 Aug. 2020 The tropical genus Bocydium, for instance, has a protrusion that looks like the dastardly Ophiocordyceps fungus, which infects ants and takes over their central nervous system—perhaps a sign that potential predators should stay away. Brigit Katz, Smithsonian Magazine, "Insect With ‘Wacky Fashion Sense’ Named After Lady Gaga," 17 Mar. 2020 Titanium is a strong and light metal, and when packed together your set will have a diameter of just 4 inches at the base, with a height of 4.3 inches (not including any minor protrusion from the foldable handles). Popular Science, "Essential cookware for your camping trip," 7 July 2020

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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Time Traveler for protrusion

Time Traveler

The first known use of protrusion was in 1646

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Statistics for protrusion

Last Updated

20 Nov 2020

Cite this Entry

“Protrusion.” Dictionary, Merriam-Webster, Accessed 19 Jan. 2021.

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More Definitions for protrusion


How to pronounce protrusion (audio)

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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