Definition of "gneisses" [gneisses]

• Plural form of gneiss. (noun)

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• "Geologically, the area is made up mainly of intensive granite and metamorphic rocks such as gneisses quartzites and schists of pre-Cambrian age."
• "The Southern Metasedimentary Mountains in North Carolina contain rocks that are not as strongly metamorphosed as the gneisses and schists of 66d."
• "Precambrian metamorphic rocks consisting of gneisses and schists, and sedimentary rocks of the Precambrian Ocoee series are predominant, while younger sedimentary rocks are found in the Appalachian Valley."