1 [mass noun] hard solid non-metallic mineral matter of which rock is made, especially as a building material:the houses are built of stone [as modifier]:high stone walls
used in similes and metaphors to refer to weight or lack of feeling, expression, or movement:Isabel stood as if turned to stonethe elevator dropped like a stone
[count noun] a small piece of rock found on the ground.
[count noun] Astronomy a meteorite made of rock, as opposed to metal.
[count noun] Medicine a calculus; a gallstone or kidney stone.
2a piece of stone shaped for a purpose, especially one of commemoration, ceremony, or demarcation:a memorial stoneboundary stones
a gem or jewel:a gold ring with a small dark red stone