Lewis & Short

părăvĕrēdus, i, m. [vox hibr., from παρά-veredus], a horse for extraordinary occasions, an extra post-horse, Cod. Just. 12, 51, 2; 19; id. Th. 8, 15, 7; 15 sq.; Cassiod. Var. 5, 39; 11, 14.