The Reaumur Scale is a temperature measurement system that was created by a French scientist named Rene-Antoine Ferchault de Reaumur in the early 18th century. This scale was commonly used in Europe, particularly in France, until it was replaced by Celsius in the mid-19th century. Synonyms for the Reaumur Scale include the degree Reaumur, the Reaumur thermometer, and the French thermometer. While this system is no longer widely used in modern times, it remains an important historical milestone in the development of accurate temperature measurement.