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[ik-stroo-zhuh n] /ɪkˈstru ʒən/
the act of extruding or the state of being extruded.
something that is extruded.
Origin of extrusion
1530-40; < Medieval Latin extrūsiōn- (stem of extrūsiō), equivalent to Latin extrūs(us) (past participle of extrūdere to extrude) + -iōn- -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for extrusion


the act or process of extruding
  1. the movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock
  2. any igneous rock formed in this way
a component or length of material formed by the process of extruding
Derived Forms
extrusible, adjective
Word Origin
C16: from Medieval Latin extrūsiō, from extrūdere to extrude
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for extrusion

1530s, from Latin extrusionem (nominative extrusio), noun of action from past participle stem of extrudere, from ex- "out" (see ex-) + trudere "to thrust, push," from PIE *treud- "to press, push, squeeze" (see threat).

Online Etymology Dictionary, © 2010 Douglas Harper
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extrusion in Medicine

extrusion ex·tru·sion (ĭk-strōō'zhən)

  1. A thrusting or forcing out of a normal position.

  2. The eruption or migration of a tooth beyond its normal occlusal position.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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extrusion in Science
  1. The emission of lava onto the surface of the Earth. ◇ 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. Compare intrusion.

  2. The process of making a shaped object, such as a rod or tube, by forcing a material into a mold.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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