Pronunciation: (är'nō; for 2 also It. är'nô), [key]
1. Peter (Curtis Arnoux Peters), 1904–68, U.S. cartoonist and author.
2. a river flowing W from central Italy to the Ligurian Sea. 140 mi. (225 km) long.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.