noun
cairn
KAIRN/kern/
A mound of stones used as a marker.
A low stone cairn marks the trail across the bare hillside.

Etymology
Scottish carne named a heap of stones. The English word keeps that concrete image for a stone pile serving as a marker or memorial.
In context
This is a cairn. A cairn marks the trail in places that it may not be obvious. Yes, it is a stack of rocks to mark the trail.
More examples
- The walkers paused beside the summit cairn.
- A cairn covered the old burial site.
- Existing cairns guided us through the rocky pass.
Forms
cairn · cairns
Similar words
- monument
- Any commemorative structure, while cairn specifically consists of piled stones.