Meaning of the word geode in English

What does geode mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

geode

US /ˈdʒiː.oʊd/
UK /ˈdʒiː.oʊd/
"geode" picture

Noun

a hollow rock lined with crystals

Example:
The museum had a stunning collection of large geodes.
She bought a small geode as a souvenir from the rock shop.