Relating to or resembling a geode, a hollow rock lined with crystals, or relating to geodesy (the measurement of Earth).
From Greek 'geodaisia' (measuring Earth). Can describe both the stone formations and the scientific discipline, though meanings have partially diverged.
A geode is like nature's surprise present—a plain, boring rock on the outside that opens to reveal a glittering cathedral of crystals inside, which is why every kid loves them.
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