borderstone

noun
UK /ˈbɔːdəstəʊn/
US /ˈbɔːrdərstoʊn/

A borderstone is a stone that marks where one piece of land ends and another begins.

The farmer placed a borderstone at the corner of his field.


OTHER MEANINGS

2. A stone used as a decorative edging along a path or garden border.

They lined the walkway with borderstones from the quarry.

3. A foundational or corner stone in old building traditions.

The borderstone of the chapel still bears the mason's mark.

4. A figurative marker of a limit or dividing point between two things.

The river served as a borderstone between the two kingdoms.