the act of extruding or the state of being extruded.
something that is extruded.

1530–40; < Medieval Latin extrūsiōn- (stem of extrūsiō), equivalent to Latin extrūs(us) (past participle of extrūdere to extrude) + -iōn- -ion

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World English Dictionary
extrusion (ɪkˈstruːʒən)
1.  the act or process of extruding
2.  a.  the movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock
 b.  any igneous rock formed in this way
3.  a component or length of material formed by the process of extruding
[C16: from Medieval Latin extrūsiō, from extrūdere to extrude]

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Word Origin & History

1540, from L. extrusionem, from ex- "out" + trudere "to thrust, push," from PIE *treud- "to press, push, squeeze" (see threat).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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
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American Heritage
Science Dictionary
extrusion   (ĭk-str'zhən)  Pronunciation Key 
  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.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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