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Derived from magma poured out or ejected at the earth's surface. Used of igneous rocks.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. tending to extrude
2. (Geological Science) (of igneous rocks) formed from magma issuing from volcanoes or cracks in the earth's crust; volcanic. Compare intrusive2
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ex•tru•sive(ɪkˈstru sɪv, -zɪv)
1. pertaining to extrusion.
2. of or pertaining to a class of igneous rocks that have been forced out in a molten or plastic condition upon the surface of the earth.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Adj.||1.||extrusive - of rock material; forced out while molten through cracks in the earth's surface|
geology - a science that deals with the history of the earth as recorded in rocks
intrusive - of rock material; forced while molten into cracks between layers of other rock
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