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 (ĭk-stro͞o′sĭv, -zĭv)
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


(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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Carube's Mackenzie Property and Amarc Resources' recently discovered IKE Deposit (592 metres of 0.44% CuEq @ 0.30% Cu, 0.032% Mo and 2.1g/t Ag), are located within the Cascade Magmatic Arc, a belt of Tertiary and younger intrusive and extrusive rocks, which stretches from Northern California up to the southern end of the Alaska Panhandle.
The global market of arsenical compounds is estimated to withstand higher growth in the forecast period due to its extrusive use in many industries.
Extrusive Luxation###1###50%###0###0%###0###0%###1###50%###0###0%
Following the leveling-aligning, a 16x22 SS wire was inserted on the upper arch, and a mini-screw placed into the root canal of the canine was used to apply extrusive forces by an elastic thread (50 g) (Figure 2, 3).
Luxation injuries of permanent teeth are true dental emergencies that occur most frequently in children between the ages of 8 and 15.1 One of the most serious of these injuries is extrusive luxation, in which the tooth is centrally displaced from its socket and exhibits increased mobility.
In our study only one patient had extrusive luxation and laceration on his permanent maxillary left first premolar caused by facial collision into a doorknob following slippage.
The fine dendritic grains are induced by water quenching of the extrusive liquid.
The material studied is an extrusive porphyritic igneous rock called rhyodacite tuff.
The rock types were initially identified by X-ray powder diffraction (XRD) and confirmed to be feldspar-quartz extrusive volcanic igneous rocks.
Knoche, who with layer upon layer of powdered clay builds powerfully evocative, extrusive objects rooted in folk religion, worked at Greenwich House Pottery, another important New York clay center.
External root resorption was most frequently associated with intrusive luxation (92.8%), followed by avulsion (89.0%), lateral luxation (80.2%), and extrusive luxation (77.4%).
Hence, a clear positive (extrusive) relation of the cooling rang and efficiency is spotted with the air flow rate, and a reverse link with water flow rate is appeared.