topstone
nounUK /ˈtɒpstəʊn/
US /ˈtɑːpstoʊn/
The stone that sits on the very top of a wall or building.
The workers placed the topstone on the garden wall.
SYNONYMS
OTHER MEANINGS
2. The highest or most important part of something.
The final chapter is the topstone of the whole book.
3. A stone placed at the top of a column or pillar.
The old pillar still had its carved topstone.
4. A finishing touch that completes a project or effort.
Her speech was the topstone of the celebration.