noun🔗ShareGneissA common and widely-distributed metamorphic rock having bands or veins, but not schistose."The countertop, made of polished gneiss, displayed swirling patterns of black and white bands. "Le comptoir, fait de gneiss poli, présentait des motifs tourbillonnants de bandes noires et blanches.geologymaterialChat with AIVocabulary GamePractice Reading