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langue d'oïl

[lahng daw-eel, daw-ee, doil]
noun
  1. the Romance language of medieval northern France: developed into modern French.
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Origin of langue d'oïl

1695–1705; < French: language of oïl (Old French; compare French oui), yes < Latin hōc ille (fēcit) this he (did)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for langue d'oil

langue d'oïl

noun
  1. the group of medieval French dialects spoken in France north of the Loire; the medieval basis of modern French
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Word Origin

literally: language of oïl (the northern form for yes), ultimately from Latin hoc ille (fecit) this he (did)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012