Frauenfeld (frouˈənfĕlt) [key], city (1993 pop. 20,300), capital of Thurgau canton, NE Switzerland, on the Murg River. Although it produces textiles, metal products, and food preserves, it is chiefly known for its 13th-century castle (now a museum), which was the seat (1712–98) of the federal diet.
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