D defs.my
Entry 1 sense Webster, 1913

Progenitor

/prōj-ĕn'-ĭt-ẽr/ · Pro·gen·i·tor · IPA /pɹoʊˈd͡ʒɛn.ɪ.tɚ/
01 n. An ancestor in the direct line; a forefather.
  1. 1.
    An ancestor in the direct line; a forefather.
    “And reverence thee their great progenitor.” Milton.