/ Dictionary / Index B Blue Nile: Meaning and Definition of Find definitions for: Blue' Nile' Pronunciation: [key] a river in E Africa, flowing NNW from Lake Tana in Ethiopia into the Nile at Khartoum: a tributary of the Nile. ab. 950 mi. (1530 km) long. Cf. Nile. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blueness blue norther Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language