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extrusion (n.)

"the act of extruding; a thrusting or driving out, expulsion," 1530s, formed as a noun of action from past-participle stem of extrudere, from ex "out, out of" (see ex-) + trudere "to thrust, push," from PIE *treud- "to press, push, squeeze" (see threat).

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Definitions of extrusion from WordNet

extrusion (n.)
something that bulges out or is protuberant or projects from its surroundings;
Synonyms: bulge / bump / hump / swelling / gibbosity / gibbousness / jut / prominence / protuberance / protrusion / excrescence
extrusion (n.)
squeezing out by applying pressure;
an unexpected extrusion of toothpaste from the bottom of the tube
Synonyms: expulsion
From wordnet.princeton.edu