The Joret line (French ligne Joret) is an isogloss used in the linguistics of the langues d'oïl. Dialects north of the line have preserved Vulgar Latin /k/ and /ɡ/ before /a/; dialects south of the line have palatalized /k/ and /ɡ/ before /a/. This palatalization gave Old French /tʃ/ and /dʒ/, then modern French /ʃ/ and /ʒ/. The line was first identified by Charles Joret and published in 1883.
To the north of the line lie the Picard language and some dialects of the Norman language. To the south and the east lie other Oïl dialects including southern Norman and French. The area north of the ligne Joret is sometimes called the Normano-Picard domain.
Read more about Joret Line: Geography, Examples, Second Isogloss, Third Isogloss, Toponymy
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