equid /ˈɛk.wɪd/adjective 1noun 1forms 1 adjective1 •Of or relating to the taxonomic family Equidae, including any equine (horse, zebra, ass, mule, etc.).Come on, this is Tetrapod Zoology: you knew those asses would be of the equid kind, right? — 2013 noun1 •Any animal of the taxonomic family Equidae, including any equine (horse, zebra, ass, mule, etc.). formsequids