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1. (n.) gneiss
a metamorphic rock, generally made up of bands that differ in color and composition, some bands being rich in feldspar and quartz, others rich in hornblende or mica.
Etymology: (1750–60; < G Gneis, ult. der. of OHG gneisto spark)
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| Definition of 'gneiss' |
Princeton's WordNet |
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1. (noun) gneiss
a laminated metamorphic rock similar to granite
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| Definition of 'gneiss' |
Webster Dictionary |
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1. (noun) gneiss
a crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss
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Definitions of gneiss 
