Centaur

From Srafopedia

In Greek mythology, the centaurs (Greek: Κένταυροι) are a race of creatures composed of part human and part horse. In early Attic vase-paintings, they are depicted as the head and torso of a human joined at the (human's) waist to the horse's withers, where the horse's neck would be.

In The Amber Spyglass, a race of people called the "Riders" are described as being similar to centaurs.