A German inhabitant of Prussia WordNet 3.0 & Open English WordNet

An extinct Baltic language, once spoken by the inhabitants of Prussia in an area of what later became East Prussia (now north-eastern Poland and the Kaliningrad Oblast of Russia) and eastern parts of Pomerelia (some parts of the region East of the Vistula river). OmegaWiki

A native or inhabitant of the geographical region of Prussia. Wiktionary

Native or inhabitant of the geographical region of Prussia. Wiktionary (translation)