OSTIARY

ostiary. Ostiary, n. the mouth of a river, a doorkeeper

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Os″ti‐a‐ry (?), n.; pl. -ries (#). [[L. ostium door, entrance. See Usher.]] 1. 1. The mouth of a river; an estuary. Sir T. Browne.
2. 2. One who keeps the door, especially the door of a church; a porter. N. Bacon.