extrusive

[ ik-stroo-siv, -ziv ]

adjective

1. tending to extrude.
2. pertaining to extrusion.
3. Also 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.

Other Words From

• nonex·trusive adjective

Word History and Origins

Origin of extrusive¹

First recorded in 1810–20; extrus(ion) + -ive

Example Sentences

What are the reasons that whenever elective and prescribed studies are mixed, an extrusive force regularly appears in the elective?

From Project Gutenberg

Deposits formed at shallow depths are related to extrusive rocks and to intrusives near the surface.

From Project Gutenberg

Thus, granite is an igneous, intrusive rock; lava is an igneous, extrusive rock.

From Project Gutenberg

In the Republics of France and of America the President is of an extrusive kind.

From Project Gutenberg

When magmas reach the surface red hot, they form extrusive rocks, such as volcanic rocks.

From Project Gutenberg

Related Words

• outstanding