Arcosolium

(in Roman catacombs) an arched recess for a sarcophagus.
Historical Examples

The priest was at the evening office, the stone lid of a martyr’s tomb placed under an arched vault (arcosolium) serving as altar.
The Death of the Gods Dmitri Mrejkowski

First, the arcosolium is not exclusively Christian in character.
The Catacombs of Rome William Henry Withrow

However, all tombs of this period fall into two groups, kk tombs and arcosolium tombs.
How to Observe in Archaeology Various

In arcosolium tombs the receptacles are benches cut in the wall, like the berths in a steamer’s cabin.
How to Observe in Archaeology Various

Other forms of very frequent recurrence are the table tomb and arched tomb, or arcosolium.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 Various

Each side of the cubiculum, except that of the entrance, usually contains a recessed tomb, either a table-tomb or an arcosolium.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 Various

The front of the arcosolium is closed by a wall, on the surface of which is an interesting fresco, which is here reproduced.
Pagan and Christian Rome Rodolfo Lanciani

A peculiar form of grave common in these chambers, as well as in the galleries, is that known as the arcosolium, or arched tomb.
The Catacombs of Rome William Henry Withrow

The arcosolium to which this is attached contains the remarkable paintings represented in the accompanying engraving.
The Catacombs of Rome William Henry Withrow