Lewis & Short

caetrātus, a, um, adj. [caetra], armed with a caetra, shield-bearing ( = πελταστής): cohors, Caes. B. C. 1, 39; so Liv. 31, 36, 1: juventus, Sil. 9, 231; and subst.: caetrā-ti, ōrum, Caes. B. C. 1, 70; Liv. 31, 36, 1; 33, 4, 4 et saep.