The main altar in a church, situated on the main axis at the east of the chancel or choir.
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.
In Ancient Rome, a place where sacred objects were kept, either in a temple (the adytum) or in a house (holding the penates)
The complex sacrum of any bird.