Artificial intelligent assistant

paving-stone

ˈpaving-stone
  A stone prepared for paving.

c 1440 Promp. Parv. 386/2 Pavynge stone, or pathynge stone, petalum. 1520 in Gross Gild Merch. II. 122 Morters of Marbill et Pavyngstonys of marbyll. 1563 Shute Archit. B j b, Couered the basket with a square pauing stone. 1802 M. Edgeworth Irish Bulls viii. 190 One of the combatants threw a small paving-stone at his opponent. 1884 J. Tait Mind in Matter (1892) 34 In tearing up the foundations of human belief, idealists have prepared paving-stones as missiles of anarchy and bloodshed.

Oxford English Dictionary

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