German

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Etymology

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alt (old) +‎ Russisch (Russian)

Proper noun

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Altrussisch n (proper noun, language name, genitive Altrussisch or Altrussischs, alternative nominative (used with the definite article) Altrussische, alternative genitive Altrussischen, no plural)

  1. Old Russian, Old East Slavic (the Old East Slavic language)
    Synonym: Altostslawisch