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trav·er·tine /ˈtrævərˌtin, -tɪn/
–noun
a form of limestone deposited by springs, esp. hot springs, used in Italy for building.Also, trav·er·tin /ˈtrævərtɪn/
[Origin: 1545–55; < It travertino, equiv. to tra– across (< L trāns– trans-) + (ti)vertino < L Tīburtīnus, equiv. to Tīburt– (s. of Tīburs) the territory of Tibur (see Tivoli) + –īnus -ine1]
Source: Dictionary.com.