Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ĕpĭchīrēma, ătis, n., = ἐπιχείρημα, rhet. t. t., a kind of argument or syllogism, Quint. 5, 10, 2 sq.; 5, 14, 5 al.