Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† mŏlybdus, i, m., and mŏlybdis, ĭdis, f., = μόλυβδος and μολυβδις, lead (pure Lat. plumbum), Stat. S. 3, 2, 30; v. molorthus.