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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.