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
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.
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
In order to mimic this structure, manufacturers use processes such as stretching, kneading, folding, layering, 3D printing and extrusion.
From Salon • Nov. 25, 2024
Dekker provided the first demonstration of this loop extrusion predicted by Mirny, collaborated on synthetic cells with Schwille, and developed new ways to use nanopores—holes or membranes of nanometer size—to sequence DNA and proteins.
From Science Magazine • Jun. 6, 2024
Somehow, for Milly, brush it over nervously as she might and with whatever simplifying hand, this abrupt extrusion of Mr. Densher altered all proportions, had an effect on all values.
From The Wings of the Dove, Volume 1 of 2 by James, Henry
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.
