bred from the best members of the same breed, strain, etc over many generations; purebred

(Thoroughbred) relating to or being a Thoroughbred

having the characteristics associated with good breeding or pedigree

(Thoroughbred) any of an English breed of horses kept chiefly for racing that originated from crosses between English mares of uncertain ancestry and Arabian stallions

a purebred or pedigree animal

somebody or something with the characteristics associated with good breeding