extrusive

[ik-stroo-siv, -ziv]
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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 of extrusive

First recorded in 1810–20; extrus(ion) + -ive
Related formsnon·ex·tru·sive, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for extrusive

extrusive

adjective
  1. tending to extrude
  2. (of igneous rocks) formed from magma issuing from volcanoes or cracks in the earth's crust; volcanicCompare intrusive (def. 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

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