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The word cetraria could not be parsed. Trying a normal dictionary lookup:
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†† 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.