earth-ball

from WordNet (r) 3.0 (2006)

earth-ball
    n 1: any of various highly prized edible subterranean fungi of
         the genus Tuber; grow naturally in southwestern Europe
         [syn: {truffle}, {earthnut}, {earth-ball}]

from The Collaborative International Dictionary of English v.0.48

earthball \earth"ball`\ n.
   any of various fungi of the genus {Scleroderma} having
   hard-skinned subterranean trufflelike fruiting bodies.

   Syn: earth-ball, false truffle.
        [WordNet 1.5]

[email protected]