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Plattdeutsch

noun
Platt·​deutsch | \ˈplat-ˌdȯich, ˈplät- \

Definition of Plattdeutsch 

: the Low German speech of northern Germany comprising several dialects

First Known Use of Plattdeutsch

1677, in the meaning defined above

History and Etymology for Plattdeutsch

German, from Dutch Platduitsch, literally, Low German, from plat flat, low + duitsch German

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The first known use of Plattdeutsch was in 1677

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