/ Dictionary / Index S Slave River: Meaning and Definition of Find definitions for: Slave' Riv'er Pronunciation: [key] a river in NE Alberta and the Northwest Territories, in Canada: flowing from Lake Athabaska NW to Great Slave Lake. 258 mi. (415 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. slaver slavery Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language