noun Petrography.
a rock fragment foreign to the igneous rock in which it is embedded.
Also called inclusion.

1900–05; xeno- + -lith

xenolithic, adjective
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World English Dictionary
xenolith (ˈzɛnəlɪθ)
a fragment of rock differing in origin, composition, structure, etc, from the igneous rock enclosing it

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American Heritage
Science Dictionary
xenolith   (zěn'ə-lĭth', zē'nə-)  Pronunciation Key 
A rock fragment foreign to the igneous mass in which it occurs. Xenoliths usually become incorporated into a cooling magma body when pieces of the rock into which the magma was injected break off and fall into it. Compare xenocryst.
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