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Noun: isogloss  'I-su,glós
  1. The geographical boundary or delineation of a certain linguistic feature; the line marking this on a map
    "A major isogloss in American English has been identified as the North-Midland isogloss, which demarcates numerous linguistic features, including the Northern Cities vowel shift.";
    - heterogloss

Derived forms: isoglosses

Type of: isarithm, isogram, isopleth

Encyclopedia: Isogloss