Sillonist
/ˈsɪlənɪst/(also Silloniste) Church History
noun
A member a progressive French Catholic movement for social reform led from 1902 to 1910 by Marc Sangnier (1873–1950), editor of the journal Le Sillon.
Origin
Early 20th century; earliest use found in The Daily News. From French silloniste, adjective and noun (both 1906 or earlier) from Le Sillon the name of the movement + -iste.