noun
also trav·er·tin ˈtravə(r)ˌtēn, -_t ə n, -tə̇n
( -s )
Etymology: F. from Italian travertino, tivertino, from Latin ( lapis ) tiburtinus tiburtine (stone), from lapis stone + tiburtinus tiburtine — more at tiburtine
: a mineral consisting of a massive usually layered calcium carbonate (as aragonite or calcite) formed by deposition from spring waters or especially from hot springs — called also calcareous sinter