scarifier

 
Pronunciation: /ˈskarɪfʌɪə, ˈskɛːrɪ-/

noun

  • a tool with spikes or prongs used for breaking up matted vegetation in the surface of a lawn.
  • a machine with spikes used for breaking up the surface of a road.
  • chiefly Australian a machine with spikes or prongs used for loosening soil.