Cobblestones are rounded stones set into an old road surface. Slippery cobblestones, laid with cobblestones, cobblestones underfoot.
They are rounded because they were river stones, which is what separates them from setts, the squared blocks most people also call cobbles. They are noisy, slippery when wet and last for centuries.
1nouncobblestonesRounded stones set into an old road surface.
“Her high heels kept getting stuck between the cobblestones of the old town.”
cobblestones is a stone.
Middle English
cobylstone
English
cobblestone
English, today
cobblestones
cobblestone comes from Middle English cobylstone, cobyllstone, kobilstane, kobill-stane, equivalent to cobble + stone. Compare Old Norse köppusteinn (“boulder”), Danish kampesten (“boulder”).
Etymology from Wiktionary, CC BY-SA