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The Adobe Flash Player is required in order to view this content. You can get it here: gneissOne entry found. Main Entry: gneiss Pronunciation: \ˈnīs\ Function: noun Etymology: German Gneis, alteration of Middle High German gneiste spark, from Old High German gneisto; akin to Old English fȳrgnāst spark Date: 1757 : a foliated metamorphic rock corresponding in composition to a feldspathic plutonic rock (as granite) — gneiss·ic \ˈnī-sik\ adjective — gneiss·oid \-ˌsȯid\ adjective — gneiss·ose \-ˌsōs\ adjective 
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