Pliohippus /,plaiәj'hipәs/ 📖 中文释义 n. [古生]上新马 📘 English Definition(英文释义) n. An extinct genus of horses from the Pliocene deposits.Each foot had a single toe (or hoof), as in the common horse. ← plioform P 字母词表 Pliohyracinae →