The first definition of Bragg in the dictionary is Billy. born 1957, British rock singer and songwriter, noted for his political protest songs; recordings include Between the Wars, Workers' Playtime, Mermaid Avenue, and England, Half English. Other definition of Bragg is Melvyn, Baron. born 1939, British novelist, broadcaster, and television executive; presenter of The South Bank Show since 1978. Bragg is also Sir William Henry, 1862–1942, British physicist, who shared a Nobel prize for physics with his son, for their study of crystal structures by means of X-rays.