river in Tuscany, central Italy, flowing west into the Ligurian Sea: c. 150 mi (241 km)
See Arno in American Heritage Dictionary 4
(ärˈnō)
A river of central Italy rising in the northern Apennines and flowing about 241 km (150 mi) to the Ligurian Sea. Flooding of the Arno has caused severe damage to art treasures in Florence.