Definition of "extrusion" [ex•tru•sion]

• The act or process of pushing or thrusting out. (noun)
• The act or process of shaping by forcing through a die. (noun)
• An object or material produced by extruding. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The disproportion is so great between the two cells, that the phenomenon does not at first suggest the idea of cell division, and it is usually described as the extrusion of the first polar body."
• "Then, in a process called "extrusion," the proteins are realigned so that the texture "mimics the fibrous nature of the muscle," which is the part we typically eat, says Phil Kerr , senior director of research and discovery for Solae LLC, a St. Louis developer of soy-based ingredients."
• "Rather than merely pushing the Himalayas upward, as some geologists believe, others have argued that the indenting Indian plate also pushed Southeast Asia and China aside towards the Pacific ocean, a process referred to as extrusion or escape tectonics."