thoroughbred

adj

Etymology: From thorough + bred.

1. Bred from pure stock.
2. Well-bred and properly educated.

noun

1. A horse of a breed derived from crosses between Arabian stallions and English mares, bred for racing, with its breeding history recorded in an official stud book.

   “He wanted to be at the white-hot center of equine sport, to become a jockey, to be able to feel the thrust and power of a Thoroughbred in its ultimate competition: racing flat out, surging to the head of the herd.”