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
Derived 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.
Extrusive rocks are often vesicular, filled with holes from escaping gas bubbles.
From Textbooks • Jan. 1, 2017
Extrusive igneous rocks have a fine-grained or aphanitic texture, in which the grains are too small to see with the unaided eye.
From Textbooks • Jan. 1, 2017
Extrusive rocks, because of their small crystals and glass, are less durable.
From Textbooks • Jan. 1, 2017
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.
