Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. cătillo, ātum, āre, v. a. [1. catillus], to lick a plate, Plaut. Cas. 3, 2, 22; Auct. ap. Fulg. 563, 7.
2. cătillo, ōnis, m. [1. catillo], a platelicker; hence, a glutton, gourmand, Lucil. ap. Macr. S. 2, 12 fin.; cf. Paul. ex Fest. p. 44 (where the best MSS. have catiliones); id. p. 90 Müll.