Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cēro, āvi, ātum, 1, v. a. [cera], to cover, overlay, or smear with wax, to wax: dolia, Col. 12, 52, 15.
More freq. in part. pass.: cerata tabula, Plaut. As. 4, 1, 18: tabella, * Cic. Div. in Caecil. 7, 24; cf. Dig. 32, 52: pennae, * Hor. C. 4, 2, 2: taedae, Ov. H. 7, 23: rates, id. ib. 5, 42; cf. puppes, id. R. Am. 447.