The Collaborative International Dictionary of English v.0.48:

Hallstatt \Hall"statt\ (h[aum]l"st[aum]t; -sht[aum]t),
Hallstattian \Hall*stat"ti*an\ (h[aum]l*st[aum]t"t[i^]*an), a.
   Of or pertaining to Hallstatt, Austria, or the Hallstatt
   civilization.
   [Webster 1913 Suppl.]

   Hallstatt civilization or Hallstattian civilization, a
      prehistoric civilization of central Europe, variously
      dated at from 1000 to 1500 b. c. and usually associated
      with the Celtic or Alpine race. It was characterized by
      expert use of bronze, a knowledge of iron, possession of
      domestic animals, agriculture, and artistic skill and
      sentiment in manufacturing pottery, ornaments, etc.
      [Webster 1913 Suppl.]

            The Hallstattian civilization flourished chiefly in
            Carinthia, southern Germany, Switzerland, Bohemia,
            Silesia, Bosnia, the southeast of France, and
            southern Italy.                       --J. Deniker.
      [Webster 1913 Suppl.]

   Hallstattian epoch, the first iron age, represented by the
      Hallstatt civilization.
      [Webster 1913 Suppl.]