/ Thesaurus / M Synonyms of missing link Find synonyms for: Noun1. missing link, ape-man, primitive, primitive personusage: hypothetical organism formerly thought to be intermediate between apes and human beingsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language