Home›Browse›G›greenstonegreenstoneOur editors are putting together more complete content — check back in about 20 minutesgreenstonegreenstone — nounnoun1. a greenish metamorphic rock used by Maori for carving and tools.1.nounDefinitiona greenish metamorphic rock used by Maori for carving and tools.ExampleThe museum displayed a beautifully carved greenstone pendant.