/ Thesaurus / M Synonyms of megacephaly Find synonyms for: Noun1. macrocephaly, megacephaly, megalocephaly, abnormality, abnormalcyusage: an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetricalWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language