ostiary

noun, plural os·ti·ar·ies.

1. Also called doorkeeper, porter. Roman Catholic Church.
   1. a member of the lowest-ranking of the four minor orders.
   2. the order itself.Compare acolyte(def 2), exorcist(def 2), lector(def 2).
2. a doorkeeper, as of a church.

noun plural -aries

1. RC Church another word for porter 2 (def. 4)