noun
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the act or process of extruding
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the movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock
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any igneous rock formed in this way
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a component or length of material formed by the process of extruding
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The emission of lava onto the surface of the Earth.
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◆ Rocks that form from the cooling of lava are generally fine-grained (because they cool quickly, before large crystals can grow) and are called extrusive rocks.
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Compare intrusion
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The process of making a shaped object, such as a rod or tube, by forcing a material into a mold.
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of extrusion
1530–40; < Medieval Latin extrūsiōn- (stem of extrūsiō ), equivalent to Latin extrūs ( us ) (past participle of extrūdere to extrude ) + -iōn- -ion
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Lowering the U.S. tariff on downstream aluminum products to 25% would have also cut roughly 66 cents per pound of duty protection from Canadian extrusion products entering the U.S.
From MarketWatch ● Aug. 31, 2026
From a technological standpoint, she noted that creating a fibrous structure through processes like extrusion is key to achieving a product with a more authentic, meat-like appearance and texture.
From Science Daily ● Nov. 4, 2025
U.S. smelting has declined under high energy costs, and there has also been chronic underinvestment in rolling, extrusion and finishing, he added.
From The Wall Street Journal ● Oct. 10, 2025
Right now, the most popular processing method is extrusion.
From Salon ● Nov. 25, 2024
The index-finger cavity is central and is seen on the upper side by a very slight rectangular perforation, which, however, does not admit the extrusion of any part of the index-finger.
Because bronchoconstriction causes so many cell extrusions, it damages the airway barrier which causes inflammation and excess mucus.
From Science Daily ● Apr. 4, 2024
For example, Mount St. Helens’ eruption that began in 2004 taught scientists that dome growth — or lava extrusions — can occur after long periods of inactivity without obvious signals.
From Seattle Times ● Nov. 7, 2023
“Aluminum extrusions, historically from Russia, are just not available, or available after many months at astronomical prices.”
From Washington Times ● Apr. 3, 2023
In the center of the hall a troupe of musicians pluck their fleshy instruments, the cartilaginous extrusions from their caved-in bellies thrumming to a familiar tune.
From Salon ● Jun. 8, 2019
Forms are built from drips, extrusions, dribbles and melting oozes.
From Los Angeles Times ● Oct. 1, 2016
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
