Find the word definition

Wikipedia
Lammtarra

Lammtarra (2 February 1992 7 July 2014) was an undefeated Thoroughbred racehorse who won three Group One races in 1995 and was voted the Cartier Three-Year-Old European Champion Colt. He won the Epsom Derby in record time, the King and Queen Elizabeth Stakes and the Prix de l'Arc de Triomphe. He is one of only two horses to win all three races, the other being Mill Reef.