Vibex, vibîcis, pen. prod. f. g. Pli. Pers. A spo tremayning in the skin after beating: the marke or print of a stripe.
Lewis and Short: Latin dictionary
vībex (vībix), īcis, f., the mark of a blow or stripe, a weal, Plaut. Fragm. ap. Varr. L. L. 7, 63 Müll.; Cato ap. Non. p. 187, 26; Plin. 30, 13, 39, 118; Pers. 4, 48; App. M. 9, p. 222, 26; cf. Fest. p. 369 Müll.