/ Dictionary / Index A Arno: Meaning and Definition of Find definitions for: Ar•no Pronunciation: (är'nō for 2 also It. är'nô), [key] — n. (Curtis Arnoux Peters), 1904–68, U.S. cartoonist and author. 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. See also: arno (Thesaurus) arnica Arnold Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language