Webster's English Dictionary

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progenitor

pro.gen.i.tor \pro--'jen-*t-*r, pr*-\ n [ME, fr. MF progeniteur, fr. L 
   progenitor, fr. progenitus, pp]. of progignere to beget, fr. pro- forth + 
   gignere to beget - more at KIN 1a: an ancestor in the direct line : 
   FOREFATHER  1b: a biologically ancestral form  2: ORIGINATOR, PRECURSOR