thoroughbred

Short definition from Wiktionary

Adjective

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

Noun

1. 1
   Alternative letter-case form of Thoroughbred (“horse bred for racing”).
2. 2
   Any purebred horse.
3. 3
   A person of uncommon strength or endurance (like that of a thoroughbred horse).
4. 4
   A well-bred person.
5. 5
   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.