The Collaborative International Dictionary of English v.0.48:
Salvo \Sal"vo\, n.; pl. Salvos. [L. salvo jure, literally, the
   right being reserved. See Safe.]
   An exception; a reservation; an excuse.
   [1913 Webster]
         They admit many salvos, cautions, and reservations.
                                                  --Eikon
                                                  Basilike.
   [1913 Webster]