blue·bird / ˈbloōˌbərd/ • n. an American songbird (genus Sialia) of the thrush family, the male of which has a blue head, back, and wings.

Bluebird name of a series of boats and cars in which Malcolm Campbell (1885–1948) and his son Donald Campbell (1921–67) broke world land and water speed records. The last Bluebird, in which Donald Campbell had been killed over 30 years earlier attempting to break his own water speed record, was raised from Coniston Water on 8 March 2001.

bluebird North American songbird with blue plumage, a member of the thrush subfamily. There are three species. Typically, a bluebird lays its eggs (usually four to six) in a grass-and-weed-lined nest in a hole in a tree or fence post. Length: 7in (17.8cm). genus Sialia.