Breadcrumb Home > Thesaurus > O Synonyms of ornithorhynchus Find synonyms for: Noun1. Ornithorhynchus, genus Ornithorhynchus, mammal genususage: type genus of the family OrnithorhynchidaeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ornithorhynchus (Dictionary) ✖ Related Content Daily Word Quiz: rococo Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language