noun see: gloss Date: 1925 a boundary line between places or regions that differ in a particular linguistic feature, a line on a map representing an ~, ~al adjective ~ic adjective
ISOGLOSS
Meaning of ISOGLOSS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012