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Definition of gneiss - a metamorphic rock with a banded or foliated structure, typically coarse-grained and consisting mainly of feldspar, quartz, and mi Definition of gneiss - a metamorphic rock with a banded or foliated structure, typically coarse-grained and consisting mainly of feldspar, quartz, and mi dictionary thesaurus
Definition of GNEISS. : a foliated metamorphic rock corresponding in composition to a feldspathic plutonic rock (as granite). â gneissÂ·ic \ËnÄ«-sik\ adjective. â gneissÂ·oid \-ËsoÌid\ adjective.