Any one of several kinds of roundish, subterranean fungi, usually of a blackish color. The French truffle (
Tuber melanosporum) and the English truffle (
Tuber æstivum) are much esteemed as articles of food. [
1913 Webster]
"When trained, certain pigs have a peculiar ability to smell truffles which lie underground, making them useful for searching out hidden truffles."
[1913 Webster]