Breadcrumb Home > Thesaurus > E Synonyms of epiphenomenon Find synonyms for: Noun1. epiphenomenon, by-product, byproductusage: a secondary phenomenon that is a by-product of another phenomenonWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of epiphenomenon (Dictionary) ✖ Related Content Daily Word Quiz: hieratic Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language