noun 1.Re·né An·toine Fer·chault de /rəˈneɪ ɑ̃ˈtwan fɛrˈʃoʊ də/ Show Spelled [ruh-ney ahn-twan fer-shoh duh] Show IPA , 1683–1757, French physicist and inventor.
adjective 2.Also, Re·au·mur. noting or pertaining to a temperature scale
(Réaumur scale) in
which 0° represents the ice point and 80° represents the steam point.