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]