Appii Forum (ăp'py-î-fô'rum), forum, or market-place of Appius. A well-known station on the Appian road, which led from Rome to Capua. It doubtless derived its name from Appius Claudius, who constructed the road. It was about 43 Roman miles from Rome, and its site is marked by some ruins near Treponti. A body of Christians from Rome met Paul at this place. Acts 28:15.