/ Dictionary / Index L lost tribes: Meaning and Definition of Find definitions for: lost' tribes' Pronunciation: [key] the members of the ten tribes of ancient Israel who were taken into captivity in 722 b.c. by Sargon II of Assyria and are believed never to have returned to Palestine. II Kings 17:1–23. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lost river lost-wax process Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language