Origin: L ostiarius from ostium, door, entrance from os, mouth: see oral
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noun pl. os·ti·ar·ies
- Roman Catholic Church One who is ordained in the lowest of the former minor orders.
- A church doorkeeper.
Origin: Middle English hostiary, from Latin ōstiārius, doorkeeper, from ōstium, door, from ōs, mouth; see ōs- in Indo-European roots.