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
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.
“We’ve become disadvantaged pretty significantly,” said Jeff Lehman, North America president for Norsk Hydro’s aluminum extrusion business.
From The Wall Street Journal • Apr. 2, 2026
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
In previous studies, the scientists found that the chemical compound gadolinium can block extrusion.
From Science Daily • Apr. 4, 2024
FIG.40.—Completion of the process of extrusion of the chromatic material; fn shows the two chromosomes retained in the egg forming the female pronucleus.
From The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity by Conn, H. W. (Herbert William)
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.
