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extrusive

[ik-stroo-siv, -ziv] /ɪkˈstru sɪv, -zɪv/
adjective
1.
tending to extrude.
2.
pertaining to extrusion.
3.
Also, effusive. Geology. noting 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.
Origin
1810-1820
1810-20; extrus(ion) + -ive
Related forms
nonextrusive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for extrusive
  • extrusive rocks are more difficult to clearly identify because the mineral grains are typically invisible.
  • Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies.
  • These rocks are characterized as either extrusive or intrusive.
  • extrusive rocks are made of small, often microscopic crystals, which indicate rapid cooling and little time for crystal growth.
  • Once you know you have an igneous rock, look at the texture to decide if it is intrusive or extrusive.
  • The rock capping the mesa is an extrusive form of granite called rhyolite.
  • Deposits related to subaerial mafic extrusive rocks.
  • The dam is located in a narrow steep-sided valley cut through several hundred of igneous extrusive and extrusive rock.
  • Show me all extrusive igneous rock units that contain sanidine.
  • Display all extrusive igneous rock units that contain sanidine.
British Dictionary definitions for extrusive

extrusive

/ɪkˈstruːsɪv/
adjective
1.
tending to extrude
2.
(of igneous rocks) formed from magma issuing from volcanoes or cracks in the earth's crust; volcanic Compare intrusive (sense 2)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for extrusive
adj.

1816, from Latin extrusus, past participle of extrudere (see extrusion) + -ive. Related: Extrusively.

Online Etymology Dictionary, © 2010 Douglas Harper
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