2. castus, ūs (abl. heterocl. casto, Tert. Jejun. 16; Fest. s. v. minuitur, p. 154, 6 Müll.), m. [1. castus], ante- and post-class. for castimonia, an abstinence from sensual enjoyments on religious grounds, Naev. ap. Non. p. 197, 16; Varr. ib.; Gell. 10, 15, 1; Arn. 5, p. 167.