flagstonePronunciation: /ˈflagstəʊn/Translate flagstone | into French | into German | into Italian | into Spanish Definition of flagstone noun a flat stone slab, typically rectangular or square, used for paving: there was a carpet on the flagstones of the hall [as modifier]:a flagstone terraceDerivatives flagstoned adjective flagstone in other Oxford dictionaries Definition of flagstone in the US English dictionary