| Thoroughbred | |
| 1. n. 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. (Sometimes lowercase: thoroughbred.) | |
| 2. adj. Bred from pure stock. | |
| 3. adj. Well-bred and properly educated. | |
| 4. n. A horse of a breed derived from crosses between Arabian stallions and English mares, bred for racing. (usually capitalized: Thoroughbred.) | |
| 5. n. (nonstandard, loosely) Any purebred horse. | |
| 6. n. A person of uncommon strength or endurance (like that of a thoroughbred horse). | |
| That athlete is a real thoroughbred. | |
| 7. n. A well-bred person. | |
