adjective
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tending to extrude
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(of igneous rocks) formed from magma issuing from volcanoes or cracks in the earth's crust; volcanic Compare intrusive
Other Word Forms
Etymology
Origin of extrusive
First recorded in 1810–20; extrus(ion) + -ive
Vocabulary lists containing extrusive
Physical Geography - High School
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Earth Science - Middle School
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Rocks and Minerals - Introductory
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Basalt and gabbro are the extrusive and intrusive names for mafic igneous rocks, and peridotite is ultramafic, with komatiite as the fine-grained extrusive equivalent.
From Textbooks • Jan. 1, 2017
In some cases, extrusive lava cools so rapidly it does not develop crystals at all.
From Textbooks • Jan. 1, 2017
When lava is extruded onto the surface, or intruded into shallow fissures near the surface and cools, the resulting igneous rock is called extrusive or volcanic.
From Textbooks • Jan. 1, 2017
Andesite is a fine crystalline intermediate extrusive rock.
From Textbooks • Jan. 1, 2017
Deposits formed at shallow depths are related to extrusive rocks and to intrusives near the surface.
From The Economic Aspect of Geology by Leith, C. K. (Charles Kenneth)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
