Primogenitor
Pronunciation : Pri`mo*gen"i*tor
Part of Speech : n.
Etymology : [LL., fr. L. primus first + genitor a begetter.]
Definition : Defn: The first ancestor; a forefather.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder