Dictionary.net

• Pertaining to or brought from Xanthus; as the Xanthian marbles in the British Museum.

1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.

• Pert. to or brought from Xanthus.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.