1. Also called flag. a flat stone slab used especially for paving.
  2. flagstones, a walk, terrace, etc., paved with flagstones.
  3. rock, as sandstone or shale, suitable for splitting into flagstones.


  1. a hard fine-textured rock, such as a sandstone or shale, that can be split up into slabs for paving
  2. a slab of such a rock

1730, from flag (n.2) “flat, split stone” + stone (n.).

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