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The Collaborative International Dictionary

Extrusion \Ex*tru"sion\, n. The act of thrusting or pushing out; a driving out; expulsion.

Douglas Harper's Etymology Dictionary

1530s, formed as a 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).


n. 1 A manufacturing process where a billet of material is pushed and/or drawn through a die to create a shaped rod, rail or pipe. 2 An item formed by the process of extrusion.

  1. n. something that bulges out or is protuberant or projects from a form [syn: bulge, bump, hump, gibbosity, gibbousness, jut, prominence, protuberance, protrusion, excrescence]

  2. squeezing out by applying pressure; "an unexpected extrusion of toothpaste from the bottom of the tube"; "the expulsion of pus from the pimple" [syn: expulsion]


Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed through a die of the desired cross-section. The two main advantages of this process over other manufacturing processes are its ability to create very complex cross-sections, and to work materials that are brittle, because the material only encounters compressive and shear stresses. It also forms parts with an excellent surface finish.

Drawing is a similar process, which uses the tensile strength of the material to pull it through the die. This limits the amount of change which can be performed in one step, so it is limited to simpler shapes, and multiple stages are usually needed. Drawing is the main way to produce wire. Metal bar and tube are also often drawn.

Extrusion may be continuous (theoretically producing indefinitely long material) or semi-continuous (producing many pieces). The extrusion process can be done with the material hot or cold. Commonly extruded materials include metals, polymers, ceramics, concrete, play dough, and foodstuffs. The products of extrusion are generally called "extrudates".

Hollow cavities within extruded material cannot be produced using a simple flat extrusion die, because there would be no way to support the centre barrier of the die. Instead, the die assumes the shape of a block with depth, beginning first with a shape profile that supports the center section. The die shape then internally changes along its length into the final shape, with the suspended center pieces supported from the back of the die. The material flows around the supports and fuses together to create the desired closed shape.

The extrusion process in metals may also increase the strength of the material.

Usage examples of "extrusion".

The most common types were swollen barrellike domes, multibranched massed thickets, and spaghettilike tangled extrusions that moved very slightly in the faint and odorous breeze.

His shirt sagged on him in some places, as if the substance of him had melted away beneath it, but in other places it strained at the seams as his body acquired new bony extrusions and inhuman excrescences.

They discussed the article on polymer extrusions from alien silicates, he studied the c-v drive specs yet another time, relaxed over a coffee while the two worked a crossword puzzle in Deltan symbology, and then he bade her a fond goodnight and went to bed again.

First, we have no evidence that any other bits, pieces, pseudopods, or extrusions of the Foe other than the ones Robin encountered on Tahiti exist anywhere else in the Galaxy.

They were of glass, he saw a moment later, a towering range formed by extrusion of vast masses of molten silicates from the planet.

Slave Women are brought here from ev'rywhere in this Hemisphere, to serve as dreamy, pliant shadows, Baths of Flesh darker than Dutch, the dangerously beautiful Extrusion of everything these white brothers, seeking Communion, cannot afford to contain, whilst their wives, if adverted to at all, are imagin'd at home, sighing over needlework, or the Bible.

I’m not sure I can conceive any practical uses for them--they’re either distortions in the geometry, space-time extrusions and crystallizations, or .

There was no hatch to this cubicle, only a fabric curtain which rustled in faint stirrings from the agrarium to which this extrusion was attached.

There was no hatch to this cubicle, only a fabric curtain which rustled in faint stirrings from the agrarium to which this extrusion was attached.

The all-over carpeting seemed to roll and flow, rearing softly here and there into furniture that was rounded extrusions and lumps in a suite seemingly coated in a form of teal blue indigo.

I think it's taking a great deal out of him, running an infinite-array scan every time you drop out of sight, then formulating a new extrusion and extending full sensory linkages to it—.

He held the accurate note even after his pitched cutter was excising a pentagon from the uneven extrusion of quartz, which flashed from different facets as the sunlight shifted.

The float skids, normally long and faired extrusions of the pod’s bottom curve, had been cranked out manually and locked in position.

Hands grasp, pedipalpi quiver, spiracles ripple, pincers snap like scissors, and other ill-defined extrusions appear and at once vanish in a roiling tumult of glistening carapaces that melt into whipping tails, in snarls of coarse hair that smooth into scaly flanks, expressing a biological chaos that makes Curtis's confusion in the twins' bathroom seem, by comparison, merely an amusing faux pas.

He kept his eye open for unusual extrusions to use as landmarks, but the sides had sheared clean for almost four minutes of flight.