Lewis Short
(verb) : per-vasto, āvi, ātum, 1
* To lay waste, devastate: fines,Liv. 6, 4: pervastatis passim agris,id. 8, 19: pervastata Italia,Tac. A. 15, 45: Boii Laevos cum pervastassent,Liv. 33, 37, 6.
Charlton T. Lewis, Charles Short, A Latin Dictionary