flagstone

(flagstōn′)

noun

  1. any hard stone that splits into flat pieces used in paving walks, terraces, etc.
  2. a piece of such stone

Origin: flag + stone

See flagstone in American Heritage Dictionary 4

noun
  1. A flat slab of stone used as a paving material.
  2. An evenly layered sedimentary rock that can be split into paving stones.

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