Definition of geode noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈdʒiːəʊd//
; NAmE NAmE//ˈdʒiːoʊd//
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a small hole in rock that has crystals around the inside Word Origin late 17th cent.: via Latin from Greek geōdēs ‘earthy’, from ‘earth’.
See the Oxford Advanced American Dictionary entry: geode