Definition of isogloss noun from the Oxford Advanced American Dictionary

 

isogloss

 noun
noun
NAmE//ˈaɪsəˌɡlɔs//
 
, NAmE//ˈaɪsəˌɡlɑs//
 
(linguistics)
 
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a line on a map that separates places where a particular feature of a language is different
See the Oxford Advanced Learner's Dictionary entry: isogloss