subdialect

noun sub·di·a·lect \ ˌsəb-ˈdī-ə-ˌlekt \
variants: or sub-dialect

Definition of subdialect

plural subdialects or sub-dialects
: a dialect of a language that is a regional subvariety of a more widely spoken dialect
  • Today Aleut is a single language with two main dialects, Western (Attuan and Atkan subdialects) and Eastern.
  • —William W. Fitzburg & Aron Crowell

First Known Use of subdialect

1642

in the meaning defined above

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