/ Thesaurus / O Synonyms of orthopter 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. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language