Definition of extrusion

• 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"
• squeezing out by applying pressure; "an unexpected extrusion of toothpaste from the bottom of the tube"; "the expulsion of pus from the pimple"