per-vasto, āvi, ātum, 1, v. a.,
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.
per-vāstō āvī, ātus, āre, to lay waste, devastate: pervastatis agris, L.: Laevos, L. ...
An Elementary Latin Dictionary