Building Block
A block of material used in construction work.
This concept's ID is @1~15521
Arch
- headstone
The central building block at the top of an arch or vault.
- voussoir
Wedge-shaped stone building block used in constructing an arch or vault.
Also contains
- ashlar
A rectangular block of hewn stone used for building purposes.
- cinder block
A light concrete building block made with cinder aggregate; "cinder blocks are called...