WordReference Random House Unabridged Dictionary of American English © 2017
ex•tru•sion  (ik stro̅o̅zhən),USA pronunciation n. 
  1. the act of extruding or the state of being extruded.
  2. Metallurgysomething that is extruded.
  • Medieval Latin extrūsiōn- (stem of extrūsiō), equivalent. to Latin extrūs(us) (past participle of extrūdere to extrude) + -iōn- -ion
  • 1530–40

WordReference Random House Learner's Dictionary of American English © 2017
ex•trude /ɪkˈstrud/USA pronunciation   v. [+ object], -trud•ed, -trud•ing. 
  1. Geologyto force or press out, as through a small opening that gives shape:The spaghetti-making machine extrudes dough through tiny holes.
ex•tru•sion /ɪkˈstruʒən/USA pronunciation  n. [uncountable]See -trude-.

WordReference Random House Unabridged Dictionary of American English © 2017
ex•trude  (ik stro̅o̅d),USA pronunciation v.,  -trud•ed, -trud•ing. 
  1. Geologyto thrust out; force or press out;
    expel:to extrude molten rock.
  2. Metallurgyto form (metal, plastic, etc.) with a desired cross section by forcing it through a die.

  1. to protrude.
  2. Metallurgyto be extruded:This metal extrudes easily.
ex•truder, n. 
ex•tru•si•ble  (ik stro̅o̅sə bəl, -zə-),USA pronunciation  ex•truda•ble, adj. 
  • Latin extrūdere to thrust out, drive out, equivalent. to ex- ex-1 + trūdere to thrust, push
  • 1560–70

Collins Concise English Dictionary © HarperCollins Publishers::

extrusion /ɪkˈstruːʒən/ n
  1. the act or process of extruding
  2. the movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock
  3. any igneous rock formed in this way
  4. a component or length of material formed by the process of extruding
Etymology: 16th Century: from Medieval Latin extrūsiō, from extrūdere to extrude

'extrusion' also found in these entries:

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