keystone
key·stone / ˈkēˌstōn/ • n. a central stone at the summit of an arch, locking the whole together. ∎ [usu. in sing.] the central principle or part of a policy, system, etc., on which all else depends: cooperation remains the keystone of the government's security policy.
keystone
keystone. Wedge-shaped key-block at the crown of an arch to consolidate a structure.
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Stone , stone / stōn/ • n. 1. the hard, solid, nonmetallic mineral matter of which rock is made, esp. as a building material: the houses are built of stone |… George Whetstone , whetstone •flagstone, ragstone •Blackstone, jackstone •sandstone • capstone • hearthstone •headstone • gemstone • whetstone •hailstone • gravestone •… soapstone , soapstone •flagstone, ragstone •Blackstone, jackstone •sandstone • capstone • hearthstone •headstone • gemstone • whetstone •hailstone • gravestone •… Moonstone , moonstone •flagstone, ragstone •Blackstone, jackstone •sandstone • capstone • hearthstone •headstone • gemstone • whetstone •hailstone • gravestone •… cairn , cairn / ke(ə)rn/ • n. 1. a mound of rough stones built as a memorial or landmark, typically on a hilltop or skyline. ∎ a prehistoric burial mound mad… Bluestone , Skip to main content
bluestone
bluestone •flagstone, ragstone •Blackstone, jackstone •sandstone • capstone • hearthstone •headstone • gemstone • whet…
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