crownstone
nounUK /ˈkraʊnstəʊn/
US /ˈkraʊnstoʊn/
A crownstone is the special stone at the top of a wall or building.
The old wall had a carved crownstone right at the top.
OTHER MEANINGS
2. A stone set at the highest point of an arch or gable to hold the parts together.
The builders lifted the crownstone into place at the peak of the arch.
3. A decorative stone shaped like a crown, often used in old buildings.
Above the doorway sat a crownstone carved with tiny points.
4. A boundary marker stone once used to show where land ended.
The farmer pointed to the crownstone that marked the edge of his field.