sacrarium

plural sacrariums · plural sacraria

1. historicalIn Ancient Rome, a place where sacred objects were kept, either in a temple (the adytum) or in a house (holding the penates)
2. The area surrounding the altar of a Christian church; the sanctuary or piscina. Sometimes specifically a drain directly to the earth, perhaps including reference to a basin, for washing vessels from consecration.

   2016, Martin Pousson, Black Sheep Boy, Los Angeles: Rare Bird Books, Part I, “Wanted Man,” The bathroom looked like a radiant sacristy, the sink a piscine, the drain a sacrarium.

   1 more example

   The hay-trusser deposited his basket by the font, went up the nave till he reached the altar-rails, and opening the gate entered the sacrarium, where he seemed to feel a sense of the strangeness for a moment; then he knelt upon the footpace.

   1886, Thomas Hardy, chapter 2, in The Mayor of Casterbridge

3. anatomyThe complex sacrum of any bird.