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WordNet (r) 3.0 (2006) (WordNet)

extrusion
n 1: something that bulges out or is protuberant or projects
from its surroundings; "the gun in his pocket made an
obvious bulge"; "the hump of a camel"; "he stood on the
rocky prominence"; "the occipital protuberance was well
developed"; "the bony excrescence between its horns" [synonym:
{bulge}, {bump}, {hump}, {swelling}, {gibbosity},
{gibbousness}, {jut}, {prominence}, {protuberance},
{protrusion}, {extrusion}, {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" [synonym: {extrusion}, {expulsion}]