Definitions for cobblestoneˈkɒb əlˌstoʊn
Random House Webster's College Dictionary
a naturally rounded stone, larger than a pebble and smaller than a boulder, formerly used in paving.
Origin of cobblestone:
1400–50; late ME cobylstone
cobble, cobblestone, sett(verb)
rectangular paving stone with curved top; once used to make roads
pave with cobblestones
A rounded stone from a river bed, fit for use as ballast in ships and for paving roads.
Origin: From kobilstane, from cobble (probably a diminutive of one of various words cob, presumed to stem from a Proto-Germanic root kubb- "something rounded") + stan
a large pebble; a rounded stone not too large to be handled; a small boulder; -- used for paving streets and for other purposes