Breadcrumb Home > Thesaurus > O Synonyms of ornithopter Find synonyms for: Noun1. orthopter, ornithopter, heavier-than-air craftusage: heavier-than-air craft that is propelled by the flapping of wingsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ornithopter (Dictionary) ✖ Related Content Daily Word Quiz: ultimathule Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language