Definitions
1.nounA horse of a breed derived from crosses between Arabian stallions and English mares, bred for racing. (usually capitalized: Thoroughbred.)
2.nounAny purebred horse.
3.nounA person of uncommon strength or endurance (like that of a thoroughbred horse)."That athlete is a real thoroughbred."
4.nounA well-bred person.
5.adjectiveBred from pure stock.
6.adjectiveWell-bred and properly educated.