[zen-uh-krist, zee-nuh-]
noun Mineralogy.
a rock or crystal engulfed by magma and retained as an inclusion in the resulting igneous rock.

xeno- + cryst(al)

xenocrystic, adjective
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World English Dictionary
xenocryst (ˈzɛnəˌkrɪst)
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 & Unabridged 10th Edition
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American Heritage
Science Dictionary
xenocryst   (zěn'ə-krĭst', zē'nə-)  Pronunciation Key 
A crystal foreign to the igneous rock in which it occurs. Xenocrysts usually form during metamorphism. Compare xenolith.
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