Also found in: Thesaurus, Encyclopedia, Wikipedia.
A crystal foreign to the igneous rock in which it occurs.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) a crystal included within an igneous rock as the magma cooled but not formed from it
[C20: from xeno- + cryst(al)]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014