1. geode
noun. (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals.
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Example sentences of the word geode
1. Noun, singular or mass
You can place the geode inside a sock and hit it on something very hard.
2. Adjective
Some stores sell geode jewelry, but if you are lucky enough to find geodes of the right size and shape, you can make your own.