riverstone
nounUK /ˈrɪvəstəʊn/
US /ˈrɪvərstoʊn/
A smooth round stone that has been worn by a river.
She skipped a flat riverstone across the water.
OTHER MEANINGS
2. A decorative stone used in landscaping and gardens.
The path was lined with riverstones.
3. A brand or trade name for natural stone tiles and paving.
They installed riverstone tiles in the bathroom.
4. A place name or surname referring to a settlement by a river.
The village of Riverstone sits beside the old mill.