from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A crystal foreign to the igneous rock in which it occurs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a crystal that does not occur in a specific igneous rock
from The Century Dictionary and Cyclopedia
- n. In petrography, a term proposed by Sollas for a crystal in an igneous rock which has been included by the igneous magma before the solidification of the rock.
xeno- + cryst(al).(American Heritage® Dictionary of the English Language, Fourth Edition)