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

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

From Project Gutenberg

Related Words

• outstanding