primogenitor

/ˌˈpraɪmoʊˌdʒɛnədər/

Other forms: primogenitors

Definitions of primogenitor

1. noun

   an ancestor in the direct line
   synonyms: progenitor

   types:

   genitor

   a natural father or mother

   parent

   a father or mother; one who begets or one who gives birth to or nurtures and raises a child; a relative who plays the role of guardian

   type of:

   ancestor, antecedent, ascendant, ascendent, root

   someone from whom you are descended (but usually more remote than a grandparent)