TRUFFLE n.
Any one of several kinds of roundish, subterranean fungi, usually of a blackish color. The French truffle (Tuber melanosporum) and the English truffle (T. æstivum) are much esteemed as articles of food. Truffle worm (Zoöl.), the larva of a fly of the genus Leiodes, injurious to truffles. Truffle pig, a pig used for fin…
VOLCANIC a.
rm, built up of cinders, tufa, or lava, during volcanic eruptions. -- Volcanic foci, the subterranean centers of volcanic action; the points beneath volcanoes where the causes producing volcanic phenomena are most active. -- Volcanic glass, the vitreous form of lava, produced by sudden cooling; obsidian. See Obsidian…