Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† emphăsis, is, f., = ἔμφασις, a figure of rhet., emphasis, rhetorical stress (cf.: pondus, significatio), Quint. 9, 2, 64; 8, 2, 11; 8, 3, 86 al.