Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
căvātus, a, um, v. cavo, P. a.
căvo, āvi, ātum, 1, v. a. [cavus], to make hollow, to hollow out, excavate (class., but not in Cic.; for in Leg. 2, 18, 45, dicato is the correct reading, B. and K.): stillicidi casus lapidem cavat, Lucr. 1, 313; cf. Ov. M. 4, 525: naves ex arboribus, Liv. 21, 26, 9: arbore lintres, Verg. G. 1, 262: buxum, id. ib. 2, 450: dentes cavantur tabe pituitae, Plin. 7, 16, 15, § 70: luna cavans cornua (in waning), id. 8, 17, 23, § 63: parmam galeamque gladio, i. e. to pierce through, perforate, Ov. M. 12, 130: tegmina tuta cavant capitum, hollow out, poet. for round off, bend around, fabricate, Verg. A. 7, 632.
Hence, căvātus, a, um, P. a., hollowed, excavated, hollow: alni, Verg. G. 1, 136: cortices, id. ib. 2, 387: rupes, id. A. 3, 229: anfracta aurium, Varr. ap. Non. p. 193, 3: oculi, Lucr. 6, 1194 (with cava tempora): vallis, Varr. L. L. 5, § 20 Müll.: torrens alibi aliter, Liv. 44, 35, 17.
Comp.: sinus cavatior, Tert. adv. Herm. 29.