isogloss(redirected from isoglottal)
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A geographic boundary line delimiting the area in which a given linguistic feature occurs.
[iso- + Greek glōssa, language, tongue.]
(Linguistics) a line drawn on a map around the area in which a linguistic feature is to be found, such as a particular pronunciation of a given word
ˌisoˈglossal, ˌisoˈglottic, ˌisoˈglossic, ˌisoˈglottal adj
i•so•gloss(ˈaɪ səˌglɒs, -ˌglɔs)
(in the study of the geographical distribution of dialects) a line on a map marking the limits of an area within which a feature of speech occurs, as the use of a particular word or pronunciation.
[< German (1892)]