primogenitor

from WordNet (r) 3.0 (2006)
primogenitor
    n 1: an ancestor in the direct line [syn: {progenitor},
         {primogenitor}]
from The Collaborative International Dictionary of English v.0.48
Primogenitor \Pri`mo*gen"i*tor\, n. [LL., fr. L. primus first +
   genitor a begetter.]
   The first ancestor; a forefather.
   [1913 Webster]
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