progenitor
noun
pro·gen·i·tor
prō-ˈje-nə-tər
prə-
1
a
: an ancestor in the direct line : forefather
b
: a biologically ancestral form
2
: precursor, originator
progenitors of socialist ideas—The Times Literary Supplement (London)
progenitor cells
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Merriam-Webster unabridged
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