Lewis & Short

pŭgillāris, e (pūg-, Juv. 11, 156), adj. [pugillus], of or belonging to the fist or hand, that can be held in the hand: testiculi, Juv. 11, 156: cerae, i. e. writing-tablets, Prud. στεφ. 9, 15; more freq. subst.: pŭgillā-res, ĭum, m. (sc. libelli), writing-tablets, Sen. Ep. 15, 6; 108, 6; Plin. 16, 16, 27, § 68; 13, 11, 21, § 69; Plin. Ep. 1, 6, 1; 6, 5, 6; Suet. Aug. 39; sing., Vulg. Luc. 1, 39.
Also pŭgillāria, ĭum, n., Laber. ap. Charis. p. 75 P.; Cat. 42, 4; Gell. 17, 9, 17.
In sing.: pŭgillar, āris, n., a writing-tablet, Aus. Epig. 146.