Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rictus, ūs, m. (collat, form rictum, i, n., Lucr. 6, 1195; Cic. Verr. 2, 4, 43, § 94; plur. ricta, Lucr. 5, 1064; cf. Non. 221, 18 sq.) [ringor], the aperture of the mouth, the mouth wide open (esp. for laughing; class.; cf. hiatus): rictus parvissimus, Varr. ap. Non. 456, 9; Lucil. Titin. and Pompon. ib.; Lucr. 6, 1195; Cic. l. l.; Quint. 1, 11, 9; Suet. Claud. 30; Flor. 3, 11 fin.; Hor. S. 1, 10, 7; Juv. 10, 230 al.
Plur., Ov. A. A. 3, 283; id. M. 11, 126.
Of animals, gaping, distended jaws, Ov. M. 1, 741; 2, 481; Juv. 10, 272.
Plur., Lucr. 5, 1064; Ov. M. 3, 674; 4, 97; 6, 378; 11, 59; 14, 65 et saep.