Extany A rhinoceros (/raɪˈnɒsərəs/, from Greek, Modern rhinokeros, meaning 'nose-horned', from rhinos, meaning 'nose', and kerato/keras, meaning 'horn'), commonly abbreviated to 'rhino', is one of any five extant species of odd-toed ungulates in the family Rhinocerotidae, as well as any of the numerous extinct species.