Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† aptōta (nomina), ōrum, n., = ἄπτωτα (without case); in gram., substantives that are not declined, aptotes (e. g. dicis, fas, frit, git, etc.), Diom. p. 287; Prisc. 5, p. 669.