5 letters · 7 points in Scrabble
noun (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals
originFrom French géode, from Latin geōdēs, from Ancient Greek γεώδης (geṓdēs, “earthlike”), equivalent to γῆ (gê, “earth”) + -ώδης (-ṓdēs).
Etymology from Wiktionary, CC BY-SA 3.0