Progenitor | Webster's Dictionary of the English Language

progenitor
prōgĕnĭtor, ōris, m. [progigno], the founder of a family , an ancestor , progenitor (very rare; n...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
progenitor
prōgenitor ōris, m pro+GEN-, the founder of a family, an ancestor, progenitor : maiorum suorum, N....

An Elementary Latin Dictionary