flagstone

[flag-stohn]
noun
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.

Origin:
1720–30; flag4 + stone

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flagstone or flag (ˈflæɡˌstəʊn)
 
n
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
 
[C15 flag (in the sense: sod, turf), from Old Norse flaga slab; compare Old English flæcg plaster, poultice]
 
flag or flag
 
n
 
[C15 flag (in the sense: sod, turf), from Old Norse flaga slab; compare Old English flæcg plaster, poultice]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

flagstone
1730, from flag "flat, split stone" (1604), earlier "piece cut from sod" (1415), from O.N. flaga "stone slab," of unknown origin, perhaps related to O.N. flak (see flake).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Square-cut flagstone pavers are edged with colored concrete.
Decorative and functional, a dry-laid flagstone and mulch path leads the way to
  a patio retreat.
Then slabs of randomly cut red flagstone were laid on a gravel base.
Or something that stays cooler than concrete or flagstone under bare feet when
  you step out of a pool.
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