| 1. | of pure or unmixed breed, stock, or race, as a horse or other animal; bred from the purest and best blood. |
| 2. | (sometimes initial capital letter ) of or pertaining to the Thoroughbred breed of horses. |
| 3. | (of a person) having good breeding or education. |
| 4. | (initial capital letter ) one of a breed of horses, to which all racehorses belong, originally developed in England by crossing Arabian stallions with European mares. |
| 5. | a thoroughbred animal. |
| 6. | a well-bred or well-educated person. |