Try Our Apps


Supposedly vs. Supposably

intrusive rock


in geology, magma forced into cavities or cracks of other rocks and crystallized but not reaching the surface; also called plutonic rock , igneous intrusive rock


In composition, intrusive rocks include the entire sequence of igneous rock types from the dense and dark ultramafic peridotites to the very light-colored and low-density alkali granites and syenites.

Word Origin

1844's 21st Century Lexicon
Copyright © 2003-2014, LLC
Cite This Source
Examples from the Web for intrusive rock
Historical Examples

Word of the Day

Word Value for intrusive

Scrabble Words With Friends