Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Mĕnoetĭus, ii, m., = Μενοίτιος, the son of Actor and father of Patroclus, one of the Argonauts, Hyg. Fab. 14 and 97.
Hence, Mĕnoetĭădes, ae, m., = Μενοιτιάδης, the son of Menœtius, i. e. Patroclus, the friend of Achilles, Prop. 2, 1, 38.