This article focuses on Curonisms, i.e. words originated from Latvian based dialects spoken on the Curonian Spit and to the north of Klaipėda until 1945, which were encountered in the so-called German-Lithuanian Richter-Wörterbuch from the 18th century. These hitherto widely neglected Curonisms have been identified on the basis of the Deutsch-Kurisches Wörterbuch by Richard Pietsch, Kurisches Wörterbuch by Paul Kwauka and Richard Pietsch, the LKŽe and the Lettisch-deutsches Wörterbuch by Karl Mühlenbachs and Jānis Endzelīns.