Bussaco or Busaco, Port. Buçaco (all: bōsäˈkō) [key], locality, W central Portugal, in Beira, near Coimbra and around Mt. Bussaco. Now a summer resort, it was formerly a place of seclusion and penitence for monks. At Bussaco in 1810, British and Portuguese troops under Wellington decisively defeated the French in the Peninsular War.