primogenitor

noun

pri·​mo·​gen·​i·​tor ˌprī-mō-ˈje-nə-tər 

: ancestor, forefather

Synonyms

• ancestor
• father
• forebear
• forbear
• forebearer
• forefather
• grandfather
• progenitor

Examples of primogenitor in a Sentence

the family held a huge reunion to mark the 200th anniversary of their primogenitors' arrival in America

Word History

Etymology

borrowed from New Latin prīmogenitor (Medieval Latin, "eldest son"), from prīmo- (in Late Latin prīmogenitus "firstborn," prīmogenitūra "condition of being the firstborn") + Latin genitor "father, parent, originator" — more at primogeniture, progenitor

First Known Use

1643, in the meaning defined above