[ ik-stroo-siv, -ziv ]
/ ɪkˈstru sɪv, -zɪv /


tending to extrude.
pertaining to extrusion.
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 forms

non·ex·tru·sive, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for extrusive

British Dictionary definitions for extrusive


/ (ɪkˈstruːsɪv) /


tending to extrude
(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