eu·pat·rid 
(y-pătrĭd, ypə-trĭd)
(y-pătrĭd, ypə-trĭd)n. pl. eu·pat·ri·dae (-rĭ-dē′) or eu·pat·rids
A member of the hereditary aristocracy of ancient Athens.
[Greek eupatridēs : eu-, eu- + patēr, patr-, father; see pəter- in the Appendix of Indo-European roots + -idēs, patronymic suff.]
eu·patrid adj.