thoroughbred in WordNet English dictionary

1. having a list of ancestors as proof of being a purebred animal
   pedigree  pedigreed  pureblood  pureblooded  thoroughbred 
   

1. a pedigreed animal of unmixed lineage; used especially of horses
   thoroughbred  purebred  pureblood 
   
2. a racehorse belonging to a breed that originated from a cross between Arabian stallions and English mares
   thoroughbred 
   
3. a well-bred person
   thoroughbred