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extrusion
This term is primarily used in technical, industrial, and geological contexts. In manufacturing, it describes a specific method of shaping materials like plastics or metals, carrying a connotation of precision and industrial scale. It is distinct from molding or casting because it specifically implies a continuous, linear output through a die.
In geology, the word describes the outward movement of molten rock. While "eruption" is more common for explosive events, "extrusion" emphasizes the physical act of the material being pushed out and accumulating on the surface. Because it can refer to both the process and the resulting object, users should ensure the context clarifies whether they are discussing the action or the product.