What does "earth-ball" mean?

any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe

What is a synonym for "earth-ball"?

Common synonyms include: earthnut, truffle.

Rare ·Advanced level

Noun

1
any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe wordnet