Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ăpŏdȳtērĭum, ii, n., = ἀποδυτήριον, the undressing-room in a bathing-house, * Cic. ad Q. Fr. 3, 1, 1; Plin. Ep. 5, 6; Inscr. Orell. 3278.