gneiss (n.)youdaoicibaDictYouDict[gneiss 词源字典]
type of metamorphic rock, 1757, kneiss, from German Gneiss (16c.), which is probably from Middle High German gneist "spark" (so called because the rock glitters), from Old High German gneisto "spark" (compare Old English gnast "spark," Old Norse gneisti). Related: Gneissic.[gneiss etymology, gneiss origin, 英语词源]