[eques.tri.an] adj [L equestr-, equester of a horseman, fr. eques horseman, fr. equus horse--more at equine] (ca. 1681) 1 a: of, relating to, or featuring horseback riding b archaic: riding on horseback: mounted c: representing a person on horseback "an ~ statue"
2: of, relating to, or composed of knights
[2]equestrian n (1791): one who rides on horseback