/ Dictionary / Index L langue d'oïl: Meaning and Definition of Find definitions for: langue d'oïl Pronunciation: (läng dô-ēl', dô'ē, doil'), [key] the Romance language of medieval northern France: developed into modern French. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Languedoc languet Related Content Daily Word Quiz: malady Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language