The Collaborative International Dictionary of English v.0.48:

Appian \Ap"pi*an\, a. [L. Appius, Appianus.]
   Of or pertaining to Appius.
   [1913 Webster]

   Appian Way, the great paved highway from ancient Rome
      trough Capua to Brundisium, now Brindisi, constructed
      partly by Appius Claudius, about 312 b. c.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Appian Way
    n 1: an ancient Roman road in Italy extending south from Rome to
         Brindisi; begun in 312 BC