| Answer | Crossword Clue |
|---|---|
| ALTAR | Structure with a reredos. |
| ARENA | Structure with a skybox |
| ARCH | Structure with a keystone |
| MACLED | With a double structure |
| DAM | Structure with a spillway |
| SILO | Structure with a rounded top |
| IRIS | Structure with a pupillary zone |
| TREE | Data structure with a root node |
