Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

cascē, adv., v. cascus fin.

cascus, a, um, adj. [cf. canus], old: cascum significat vetus: ejus origo Sabina quae usque radices in Oscam linguam egit, Varr. L. L. 7, § 28; cf. Müll. Etrusk. 1, p. 41, and v. casnar: quam prisci casci populi tenuere Latini, Enn. Ann. 24 Vahl.; cf. Cic. Tusc. 1, 12, 27; so Manil. and Papin. ap. Varr. l. l.; Att. ib.: sal, Aus. Ep. 22, 27.
Hence, * cascē, adv.: casce nimis et prisce loquens, in an old-fashioned manner, Gell. 1, 10 in lemm.