Late 19th century; earliest use found in Robert Louis Stevenson (1850–1894), writer. From post-classical Latin prosator prose writer from classical Latin prōsa + -tor. Compare German Prosator.
Definition of prosator in US English:
prosator
nounprəʊˈzeɪtə
rare
A prose writer; = prosateur.
Origin
Late 19th century; earliest use found in Robert Louis Stevenson (1850–1894), writer. From post-classical Latin prosator prose writer from classical Latin prōsa + -tor. Compare German Prosator.