'Progenitor' definitions:

Definition of 'progenitor'

From: WordNet
noun
An ancestor in the direct line [syn: progenitor, primogenitor]

Definition of 'Progenitor'

From: GCIDE
  • Progenitor \Pro*gen"i*tor\, n. [OF. progeniteur, L. progenitor, fr. progignere, progenitum, to bring forth, to beget; pro forth + gignere to beget. See Gender kind.] An ancestor in the direct line; a forefather. [1913 Webster]
  • And reverence thee their great progenitor. --Milton. [1913 Webster]

Synonyms of 'progenitor'

From: Moby Thesaurus