Added 10 October 2026 racehorse noun Categories: AnimalsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about racehorse at Wordnik → Where our words come from → A horse that competes in races. Any member of certain species of genus Congiopodus. Related Words: bangtailhorsebackhorseythoroughbredsteedhorseracerhorseracehorse-race Back to today's word