Thoroughbred :  adj : having a list of ancestors as proof of being a purebred animal [syn: pedigree(a), pedigreed, pureblood, pureblooded] (noun)
1: a well-bred person [ant: mixed-blood]
2: a racehorse belonging to a breed that originated from a cross between Arabian stallions and English mares
3: a pedigreed animal of unmixed lineage; used especially of horses [syn: purebred, pureblood]

American trotter, Appaloosa, Arabian, Barb, Barbary horse, Belgian, Brahman, Cleveland Bay, French coach horse, Galloway, Hambletonian, Shetland, Shetland pony, Shire, Suffolk, Turk, archduke, aristocrat, armiger, baron, baronet, blue blood, blue-blooded, count, daimio, duke, earl, esquire, full-blooded, genet, gentleman, grand duke, grandee, hidalgo, highborn, highbred, jennet, lace-curtain, laird, landgrave, lord, lordling, magnate, magnifico, margrave, marquis, noble, nobleman, of good breed, optimate, palomino, palsgrave, patrician, pedigree, pedigreed, peer, pur sang, pure-blooded, purebred, quarter horse, saddle horse, seigneur, seignior, silk-stocking, squire, swell, upper-cruster, viscount, waldgrave, well-bred, wellborn,