Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ănĭus, ii, m., a king and priest at Delos, who hospitably entertained Æneas, Verg. A. 3, 80, ubi, v. Serv.; Ov. M. 13, 632; cf. Lycophr. Cassandr. 570.
1. ānus, i, m. [for as-nus; cf. Sanscr. ās, = to sit, seat one’s self; ἧμαι (Dor. ἧσμαι) κάθ-ημαι, Varr.; others refer it to 2. anus, from its form], the posteriors, fundament.
* 2. ānus, i, m. [related to 2. an- = ἀμφί; prim. signif. a rounding, a circular form; hence also 1. anulus; cf. Varr. L. L. 6, 8, p. 76 Müll.], an iron ring for the feet, Plaut. Men. 1, 1, 9.