/ek"sawr sist, -seuhr-/ , n.
1. a person who practices exorcism.
2. Rom. Cath. Ch.
a. a member of the second-ranking of the four minor orders.
b. the order itself. Cf. acolyte (def. 2), lector (def. 2), ostiary (def. 1).
[ 1350-1400; ME exorcista exorkistés. See EXORCISM, -IST ]