cob·ble·stone 
(kŏbəl-stōn′)
(kŏbəl-stōn′)n.
A paving stone, especially one that is naturally rounded.
[Middle English cobelston : obsolete cobel, probably diminutive of cob, round object; see COB + Middle English ston, stone, stone; see STONE.]
cobblestoneAcorn Street on Beacon Hill
Boston, Massachusetts