conceptionist
/kənˈsɛpʃ(ə)nɪst/ /kənˈsɛpʃənɪst/noun
Usually with capital initial. A nun belonging to the Congregation of the Immaculate Conception of the Blessed Virgin Mary. Compare conception. Now rare.
adjective
Usually with capital initial. Of or relating to the Roman Catholic order of the Conception.
Origin
Mid 17th century (in an earlier sense). From conception + -ist.