Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Attis, ĭdis (also Atthis or Atys, yos, and Attīn, īnis, Macr. S. 1, 21, p. 313 Bip.), m., = Ἄττις (Ἄττυς, Ἄτυς, Ἄττιν), a young Phrygian shepherd, whom Cybele loved, and made her priest on condition of perpetual chastity; but he broke his vow, became insane, and emasculated himself, Cat. 63; Ov. M. 10, 104; id. F. 4, 223; Serv. ad Verg. A. 9, 116; Macr. S. 1, 21.
Ătys or Attys, yos, m., = Ἄτυς, Ἄττυς (diff. from Attis, q. v.).