Definition of blacktop
noun
asphalt, or other black material used for surfacing roads: [as modifier]:blacktop roads a road or area surfaced with asphalt or other black material:playing hopscotch on the blacktop behind the school
verb (blacktops, blacktopping, blacktopped)
[with object] surface (a road or area) with asphalt or other black material:41 miles had been blacktopped to date
