Definition of isogloss noun from the Oxford Advanced Learner's Dictionary

 

isogloss

 noun
noun
BrE BrE//ˈaɪsəɡlɒs//
 
; NAmE NAmE//ˈaɪsəɡlɔːs//
 
, NAmE//ˈaɪsəɡlɑːs//
 
(linguistics)
 
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a line on a map that separates places where a particular feature of a language is different Word Origin early 20th cent.: from iso- ‘equal’ + Greek glōssa ‘tongue, word’.
See the Oxford Advanced American Dictionary entry: isogloss