- The definition of an isogloss is a line on a map that marks the boundary between areas where language features are different.
An example of an isogloss is the line on a map that shows the division of two populations which have different pronunciations for a a specific vowel.
isogloss definition by Webster's New World
- a line of demarcation between regions differing in a particular feature of language, as on a point of pronunciation, vocabulary, etc.
- such a line indicated on a map
Origin: ; from iso- plush Classical Greek glōssa, tongue, speech: see gloss
isogloss definition by American Heritage Dictionary
Origin: iso- + Greek glōssa, language, tongue.
- iˌso·glossˈal adjective