geode

noun

ge·​ode ˈjē-ˌōd 

1

: a nodule of stone having a cavity lined with crystals or mineral matter

2

: the cavity in a geode

Examples of geode in a Sentence

Recent Examples on the Web

Crystal Cave is not a cave in the traditional sense, but rather the interior of the world’s largest geode, discovered in 1880 by workers who were building a well. — Cailey Rizzo, Travel + Leisure, 2 Aug. 2026

Place the geode in the egg carton to dry. — Annabelle Canela, Parents, 14 Mar. 2026

This cement planter is adorned with green stones and gold trim to give the appearance of a geode. — Michele Laufik, Martha Stewart, 25 Feb. 2026

Some of the mochi resemble beautiful geodes. — Jenn Harris, Los Angeles Times, 9 Feb. 2026

Word History

Etymology

Latin geodes, a gem, from Greek geōdēs earthlike, from gē earth

First Known Use

circa 1732, in the meaning defined at sense 1

Kids Definition

geode

noun

ge·​ode ˈjē-ˌōd 

: a stone having a cavity lined with crystals or mineral matter