Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† pătrōnymĭcus, a, um, adj., = πατρωνυμικός, formed after a father’s name, patronymic; in gram.: patronymicum nomen, a patronymic, as Anchisides from Anchises, Prisc. p. 582 P. et saep.