forefather

Từ điển Oxford Advanced Learner 8th

fore·father [forefather forefathers] BrE [ˈfɔːfɑːðə(r)] NAmE [ˈfɔːrfɑːðər] noun usually plural (formal or literary)
a person (especially a man) in your family who lived a long time ago
Syn: ↑ancestor