Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† tĭāra, ae, f., or tĭāras, ae, m., = τιάρα or τιάρας, the head-dress of the Orientals, a turban, tiara: rectam capite tiaram gerens, Sen. Ben. 6, 31, 8: sceptrumque sacerque tiaras, Verg. A. 7, 247; cf. Plaut. Pers. 4, 2, 2; Ov. M. 11, 181; Val. Fl. 6, 700; Juv. 6, 516; 10, 267; Just. 1, 2, 3; App. M. 10, p. 253, 30.