primogenitor

primogenitor

[prahy-muh-jen-i-ter]
noun
1.
a first parent or earliest ancestor: Adam and Eve are the primogenitors of the human race.
2.
a forefather or ancestor.

Origin:
1645–55; < Late Latin prīmōgenitor ancestor, equivalent to Latin prīmō at first + genitor genitor

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World English Dictionary
primogenitor (ˌpraɪməʊˈdʒɛnɪtə)
 
n
1.  a forefather; ancestor
2.  an earliest parent or ancestor, as of a race
 
[C17: alteration of progenitor after primogeniture]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

primogenitor
"an ancestor," late 15c., from L.L. primogenitor (1361), from L. primo (adv.) "at first," from primus "first" (see prime (adj.)) + genitor "father," from genitus, pp. of gignere "to beget" (see genus). The fem. form is primogenitrix (1875).
Online Etymology Dictionary, © 2010 Douglas Harper
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