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/ˈdʒiː.əʊd/ · noun
(geology) A nodule of stone having a cavity lined with mineral or crystal matter on the inside wall..
Use geode when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Geode means (geology) A nodule of stone having a cavity lined with mineral or crystal matter on the inside wall..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use geode where its definition matches the intended context.
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