Term: old prussian: a dead language of the (non-German) Prussians (extinct after 1700); thought to belong to the Baltic branch of Indo-European
Broader: baltic: a branch of the Indo-European family of languages related to the Slavonic languages; Baltic languages have preserved many archaic features that are believed to have existed in Proto-Indo European | Unrelated: reactionary: an extreme conservative; an opponent of progress or liberalism