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.

†† caetra (better than cētra), ae, f. [prob. Spanish], a short Spanish shield, Verg. A. 7, 732 Serv.; Liv. 21, 27, 5; 28, 5, 11; Plin. 11, 39, 93, § 227; Tac. Agr. 36; Suet, Calig 19; Luc. 7, 232; Sil. 3, 278; 3, 348 al.
Prov.: quis rotundam facere cetram nequeat? Varr. ap. Non. p. 82, 18.

cetra, cetratus, v. caetra, etc.