Thunderhead may refer to:
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Well... is the first album released by American singer-songwriter and actress Katey Sagal. The album was originally released on April 19, 1994 by Virgin Records.
Thunderhead (foaled 1949) was a French Thoroughbred racehorse and sire, best known for winning the classic 2000 Guineas in 1952. He won once as a two-year-old and showed improved form in the spring of 1952, winning the Prix de Fontainebleau before recording an emphatic win over twenty-five opponents in the 2000 Guineas. He then finished second when favourite for the Poule d'Essai des Poulains and ran poorly when strongly-fancied for the Epsom Derby. He was later exported to South Africa where he had some success as a breeding stallion.
When racing in Britain he was known as Thunderhead II.
Thunderhead was a chestnut horse, "built more as a sprinter than a stayer" with a small white star, bred in France by Jean Desbons. He was probably the best horse sired by Merry Boy who finished second in the Prix Eugene Adam in 1941. His dam Herodiade was a great-granddaughter of the broodmare Gondolette, whose other descendants included Hyperion, Sansovino and Big Game. As a yearling, the colt was bought by Eugène Constant and sent into training with Etienne Pollet.