Gē'ōde, n.

n. [Fr. geode; Gr. γεώδης, γαιώδης, earth-like; γέα, γῆ, or γαῖα, earth, and εἶδος, form.] (Min.) (a.) A rounded nodule of stone, containing a small cavity, usually lined with crystals, though sometimes with other matter. (b.) The cavity in such a nodule.