subdialect

/ˈsʌbˌdaɪəˌlɛkt/
noun
  1. A smaller, more specific variety of a dialect, spoken in a particular area or by a particular group within a larger dialect region.
    • In this region, the local subdialect has words that are not used anywhere else in the country.
    • The older residents still speak a subdialect that sounds very different from the modern city speech.
    • The linguist studied a subdialect of Appalachian English spoken only in a few remote valleys.
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