geode

/ˈdʒiː.əʊd/

DƷIː · əʊd (2 syllables)

English Noun

Definition

A nodule of stone having a cavity lined with mineral or crystal matter on the inside wall.

Etymology

From French géode, from Latin geōdēs, from Ancient Greek γεώδης (geṓdēs, “earthlike”), equivalent to γῆ (gê, “earth”) + -ώδης (-ṓdēs).