Of or relating to Satan; satanic, fiendish, diabolical. Somewhat rare.
nounrare Christian Church
A member of an early heterodox Christian sect said to have been an offshoot of the Messalians, and whose adherents were believed to offer prayers to Satan.
Early 17th century (in an earlier sense). Partly from post-classical Latin Satanianus, noun from Satan + classical Latin -iānus.