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|Noun||1.||earth-ball - any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe|
genus Tuber, Tuber - type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles
fungus - an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia