outrider Syllabification: (out·rid·er)Pronunciation: /ˈoutˌrīdər/Translate outrider | into Italian Definition of outrider noun a person in a motor vehicle or on horseback who goes in front of or beside a vehicle as an escort or guard:an escort of police outriders a mounted official who escorts racehorses to the starting post. a cowhand who prevents cattle from straying beyond a certain limit. Derivatives outridingPronunciation: /ˌoutˈrīdiNG/ noun outrider in other Oxford dictionaries Definition of outrider in the British & World English dictionary