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| ex·tru·sion [ ik str'n ] (plural ex·tru·sions) |
noun |
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| Definition: |
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1. industry something formed by being extruded: something formed by forcing semisoft material through a specially shaped mold or nozzle
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2. industry process of extruding: the process or an instance of making something by forcing semisoft material through a specially shaped mold or nozzle
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3. geology igneous rock: an igneous rock formed by the emission of molten material magma through cracks in the Earth's surface where it forms a lava flow
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4. geology movement of molten rock: the movement of molten material magma from a volcano or through cracks in the Earth's surface to form solidified igneous rock
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| [Mid-16th century. < medieval Latin extrusion-< Latin extrudere (see extrude)] |
