A type of rounded stone or cobblestone; a stone used for paving streets or pathways, typically rounded by water action.
From 'cob' (rounded lump) plus 'stone.' Cobblestones get their name from their naturally rounded, lumpy appearance after being worn smooth by water.
Medieval cities paved their streets with cobstones because rounded ones stayed in place better than jagged stones—it's an engineering solution so effective that European cities still use them 500 years later.
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