Old Prussian
Definition: "Old Prussian" is a noun that refers to a language that was once spoken by the Prussian people, who lived in what is now part of Poland and Russia. This language is no longer used and is considered "dead," meaning no one speaks it today. Old Prussian is believed to be part of the Baltic group of languages, which are related to the Indo-European language family.
"Old Prussian" is an important term for those interested in linguistics and history, particularly regarding the languages of the Baltic region.