Definify.com
Webster 1913 Edition
Travertine
Trav′er-tine
,Noun.
[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.