gneiss
noun/naɪs/
/naɪs/
[uncountable] (geology)- a type of metamorphic rock formed at high pressure and temperature deep in the ground
片麻岩（地层深处在高压高温下形成的变质岩） Word Originmid 18th cent.: from German, from Old High German gneisto ‘spark’ (because of the rock's sheen).