Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
căcŭla (cacula, Plaut. Ps. Arg. 2, 13 sq.), ae, m. [Sanscr. cak-, to help; cf. calon; v. Paul. ex Fest. s. h. v. p. 45 Müll.; Fest. s. v. procalare, p. 225 ib.], a servant, esp. the servant of a soldier: cacula = servus militis (militaris? cf. the passage foll., from Plaut.), Fest. p. 35: cacula δοῦλος στρατιώτου, Gloss.: video caculam militarem me futurum, Plaut. Trin. 3. 2, 98; so id. Ps. Arg. 4; and perh., acc. to the MSS., also Juv. 9, 61, where Jahn reads casulis; cf. Weber, Juv. Excurs. in h. l.