Adjective
Relating to horses or horse-riding.
(relating to horses): Synonyms: (more common) equine, horselike, (rare) horsely, (obsolete, rare) horsen, (the next two somewhat informal) horsey, horsy
(relating to horse-riding): Synonym: equestrian
(humorous, dated) Relating to horse racing. [chiefly 19th c.]
Source: en.wiktionary.org