paving stone 
(British also paving slab)
noun
A large, flat piece of stone or similar material, used in paving: small plants grow between the paving stones...
- There are precast paving stones in a wide variety of sizes, shapes and colors that are perfect for borders.
- And it's the cheeky things, like setting up their little stepping stones, with my paving stones, that upset you as well.
- A local children's playground was ‘smashed to pieces’ and the paving stones from the playground were then hurled at his officers.
- rescue financing
- rescue grass
- rescue man
- rescue medication
- rescue mission
- rescue opera
- rescue package
- rescuer
- rescue race
- rescue remedy
- rescue ship
- rescue shot
- rescue work
- rescue worker
- resculpt
- resculpting
- reseal
- resealable
- research
- researchable
- research and development
- research-based
- researcher
- researchful
- research hospital