\Trav"er*tine\, n. [F. travertin, It. travertino,
tiburtino, L. lapis Tiburtinus, fr. Tibur an ancient town of
Latium, now Tivoli.] (Min.)
A white concretionary form of calcium carbonate, usually hard
and semicrystalline. It is deposited from the water of
springs or streams holding lime in solution. Extensive
deposits exist at Tivoli, near Rome.