truffle: any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe
fungus: an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia
triphosphoric acid: an acid that is a partial anhydride of three molecules of phosphoric acid; known chiefly in the form of its salts and esters