thoroughbred - a racehorse belonging to a breed that originated from a cross between Arabian stallions and English maresSir Barton - thoroughbred that won the triple crown in 1919 Gallant Fox - thoroughbred that won the triple crown in 1930 Omaha - thoroughbred that won the triple crown in 1935 War Admiral - thoroughbred that won the triple crown in 1937 Whirlaway - thoroughbred that won the triple crown in 1941 Count Fleet - thoroughbred that won the triple crown in 1943 Assault - thoroughbred that won the triple crown in 1946 Citation - thoroughbred that won the triple crown in 1948 Secretariat - thoroughbred that won the triple crown in 1973 Seattle Slew - thoroughbred that won the triple crown in 1977 Affirmed - thoroughbred that won the triple crown in 1978 |