| Ostiary 1. (n.) The mouth of a river; an estuary. 2. (n.) One who keeps the door, especially the door of a church; a porter. Thesaurus Entries acolyte, acolytus, cerberus, concierge, deacon, diaconus, doorman, exorcist, exorcista, gatekeeper, holy orders, janitor, lector, major orders, minor orders, ostiarius, ostiary, porter, presbyter, priest, reader, receptionist, subdeacon, subdiaconus, usher, warden |