/ Dictionary / Index F Fly River: Meaning and Definition of Find definitions for: Fly' Riv'er Pronunciation: (flī), [key] a river in New Guinea, flowing SE from the central part to the Gulf of Papua, ab. 800 mi. (1290 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fly rail fly rod Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language