Thoroughbred (noun)

1. A horse of a breed developed in England for racing, characterized by a long, narrow head and high-quality conformation.
2. A person or animal that is of pure or highly bred stock.

Origin:

From thorough + bred, as in purebred. the word originally referred to horses, but now also refers to other animals and humans as well.

Examples:

1. The race horse was a thoroughbred.
2. The champion racehorse was a thoroughbred.
3. They were looking for a thoroughbred dog to enter in the show.
4. She was a thoroughbred athlete and won several medals.
5. The thoroughbred horse was famous for its stamina and speed.