horseyoudaoicibaDictYouDict[horse 词源字典]
horse: [OE] The Germanic languages have gone their own way as far as the horse is concerned. The prehistoric Indo-European term for the animal was *ekwos, which produced Latin equus (source of English equestrian and equine), Greek híppos (whence English hippodrome and hippopotamus), Sanskrit açvás, and Old English eoh. Remarkably, though, this has virtually died out as the day-to-day word for ‘horse’ in the modern European branches of the Indo- European languages.

In the case of English, it has been replaced by a descendant of prehistoric Germanic *khorsam or *khorsaz: horse (German ross, now mainly a literary term equivalent to English steed, is related). Its source is not known, although some have linked it with Latin currere ‘run’.
[horse etymology, horse origin, 英语词源]