Isogloss
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An isogloss is the geographical boundary of a certain linguistic feature, e.g. the pronunciation of a vowel, the meaning of a word, or use of some syntactic feature. Dialects are typically demarcated by whole bundles of isoglosses, e.g. the Benrath line that divides High German and Low German; or the La Spezia-Rimini Line which divides the eastern Romance languages from the western ones.
The name is inspired by contour lines such as isobar, etc.; however the isogloss separates, rather than connecting points of equal language (perhaps one can say it connects points of indefinite language).de:Isoglosse es:Isoglosa li:Isoglosse hu:Izoglossza nl:Isoglosse bg:Изоглоса