A thoroughbred is a type of HORSE that has been bred for generations to be used in racing. It is an un-mixed breed, meaning it has not been crossed with any other breed. It is also PEDIGREED, meaning it has a documented lineage of ancestors. It is a PUREBRED, meaning it has been bred from the same breed for many generations. It is also a RACEHORSE, meaning it is specifically bred and trained for racing. Finally, it is a bloodstock, meaning it is a HORSE that is bred for racing or other equestrian activities.