ostiary

noun

1. (archaic)The mouth of a river; an estuary.

   “the river of Nilus hath seven ostiaries, that is, by seven channels disburdened itself into the sea”

2. One who keeps the door, especially the door of a church; a porter.

   “They had other inferiour degrees of the Clergy, vvhich becauſe they are meerly ſubſervient, and not conſiderable in Church-government, I ſhall onely touch upon them. […] Laſtly, Oſtiaries; vvhich uſed to ring the bells, and open and ſhut the Church-doores.”

   “So arrayed I stepped at last from my door and was saluted as before by my monstrous ostiaries.”