geode


Concise Oxford English Dictionary © 2008 Oxford University Press:
geode /ˈdʒiːəʊd/
noun a small cavity in rock lined with crystals or other mineral matter.

■ a rock containing such a cavity.

– derivatives
geodic /dʒiːˈɒdɪk/ adjective.
– origin C17: via L. from Gk geōdēs ‘earthy’.
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