mattestone
nounUK /ˈmæt.stəʊn/
US /ˈmæt.stoʊn/
A mattestone is a flat, dull stone that does not shine.
She found a smooth mattestone by the river and put it in her pocket.
OTHER MEANINGS
2. A stone used as a base for grinding or smoothing things.
The baker set the mattestone on the counter before rolling the dough.
3. A gray, non-reflective gemstone used in simple jewelry.
He gave her a mattestone pendant that matched her gray dress.
4. A small stone marker with a flat, unpolished face.
A mattestone marked the edge of the old garden path.