pro·​tru·​sion | \prō-ˈtrü-zhən \

Definition of protrusion 

1 : the act of protruding : the state of being protruded

2 : something (such as an anatomical part or excrescence) that protrudes

Keep scrolling for more

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.
See More

Recent Examples on the Web

Kusama started sewing the soft, phallic protrusions that became one of her hallmarks; Claes Oldenburg, who had been working with mainly hard materials at that time, switched to fabric. Chloe Schama, Vogue, "Kusama: Infinity Makes the Case for the Japanese Artist as a Feminist Force," 7 Sep. 2018 These little protrusions are very flexible and very, very strong. Dan Dubno, Popular Mechanics, "Anyone Can Be Spider-Man With DARPA's Wall-Climbing Invention," 7 Dec. 2016 The closet was a two-sided protrusion with a bar to hang clothes on, covered by a brown curtain. Michael Lindsay-hogg, Town & Country, "Brando in a Blue Blazer," 22 Aug. 2013 The resulting protrusions form a curving, translucent silhouette at the hem and sleeves. Susan Delson, WSJ, "Kimonos Meet Couture," 12 Oct. 2018 Logan and his girlfriend Chloe Bennet headed to the queen of zits to rid him of a back protrusion filled with pus. Seventeen, "Dr. Pimple Popper Dug a Hardened Cyst Out of Logan Paul's Back and It Looks Like Goat Cheese," 26 Sep. 2018 Between the simple material—cinderblock, red and white unglazed brick, and glass—and straightforward layout, with the only protrusion being a tower used to dry hoses, this fire house was an understated example of civic design. Patrick Sisson, Curbed, "Masterpieces of Robert Venturi, a postmodern architecture icon," 20 Sep. 2018 Instead of handles, there are cutouts for your hand—no protrusions. Christine Pittel, House Beautiful, "Designing a Kitchen With Scandinavian Style," 14 Mar. 2014 Those protrusions are topped by a ring of string-like filaments. David Grossman, Popular Mechanics, "New Tardigrade Species Found in Parking Lot," 28 Feb. 2018

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.

See More

First Known Use of protrusion

1646, in the meaning defined at sense 1

History and Etymology for protrusion

Latin protrudere

Keep scrolling for more

Learn More about protrusion

Share protrusion

Statistics for protrusion

Last Updated

13 Dec 2018

Look-up Popularity

Time Traveler for protrusion

The first known use of protrusion was in 1646

See more words from the same year

Keep scrolling for more

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 \

Medical Definition of protrusion 

1 : the quality or state of protruding the protrusion of a jaw

2 : something (as an anatomical part) that protrudes

Keep scrolling for more

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).


a nest or breeding place

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!