The Collaborative International Dictionary of English v.0.48:

Pompeian \Pom*pe"ian\, a. [L. Pompeianus.]
   Of, pertaining to, or characteristic of, Pompeii, an ancient
   city of Italy, buried by an eruption of Vesuvius in 79 a. d.,
   and partly uncovered by modern excavations.
   [Webster 1913 Suppl.]