fu or fuss
fu or fuss :
The German foot (see foot, above). The length of the fu varied somewhat; the Viennese version was equal to 12.444 inches or 31.608 centimeters, while the Rheinfuss (Rhine foot), used in much of western and northern Germany, was equal to 12.357 inches or 31.387 centimeters. In Bavaria a shorter fu of about 29 centimeters was used. There's no change in the plural
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