[ik-stroo-zhuh n]
See more synonyms for extrusion on Thesaurus.com

Origin of extrusion

1530–40; < Medieval Latin extrūsiōn- (stem of extrūsiō), equivalent to Latin extrūs(us) (past participle of extrūdere to extrude) + -iōn- -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for extrusion

Historical Examples of extrusion

British Dictionary definitions for extrusion


  1. 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
  2. a component or length of material formed by the process of extruding
Derived Formsextrusible, adjective

Word Origin for extrusion

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

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

extrusion in Medicine


  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.

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.