Breadcrumb Home > Thesaurus > P Synonyms of primogenitor Find synonyms for: Noun1. progenitor, primogenitor, ancestor, ascendant, ascendent, antecedent, rootusage: an ancestor in the direct lineWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of primogenitor (Dictionary) ✖ Related Content Daily Word Quiz: taradiddle Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language