Truffle, e.g

• Any of various highly prized edible subterranean fungi of the genus Tuber
• Plant with edible tuber
• `groundnut' and `monkey nut' are British terms
• A common European plant having edible tubers with the flavor of roasted chestnuts
• Grow naturally in southwestern Europe
• Truffle, e.g.
• Pod of the peanut vine containing usually 2 nuts or seeds

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Peanut \Pea"nut\, n. (Bot.) The fruit of a trailing leguminous plant ( Arachis hypog[ae]a ); also, the plant itself, which is widely cultivated for its fruit. Note: The fruit is a hard pod, usually containing two or three seeds, sometimes but one, which ...

WordNet Word definitions in WordNet
n. any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe [syn: truffle , earth-ball ] a common European plant having edible tubers with the flavor of roasted chestnuts [syn: Conopodium denudatum ...