isogloss
/ˈʌɪsə(ʊ)ɡlɒs
/noun Linguistics
A line on a map marking an area having a distinct linguistic feature.Such boundaries are called isoglosses and are themselves subjected to various shades of definition....
- The following map, for example, shows several isoglosses for different grammatical features of Anishinaabemowin.
- All words belonging to the same isogloss must have sound correspondences and clear similarities in form and meaning.
Origin
Early 20th century: from iso- 'equal' + Greek glōssa 'tongue, word'.