Added 10 October 2026 bighorn noun Categories: NatureAnimalsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about bighorn at Wordnik → Where our words come from → A river that flows from central Wyoming to the Yellowstone River in southern Montana. Wild sheep of mountainous regions of western North America having massive curled horns. Origin From big + horn. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: cimarronhornbuffalobisonbonassusargali Back to today's word