We found one dictionary that defines the word heterogloss:

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1. heterogloss: Wiktionary

Definitions from Wiktionary (heterogloss) ▸ noun:  Synonym of isogloss. ▸ Words similar to heterogloss ▸ Usage examples for heterogloss ▸ Idioms related to heterogloss ▸ Wikipedia articles (New!) ▸ Popular adjectives describing heterogloss ▸ Words that often appear near heterogloss ▸ Rhymes of heterogloss ▸ Invented words related to heterogloss