'Big Dipper' definitions:

Definition of 'Big Dipper'

(from WordNet)
noun
A group of seven bright stars in the constellation Ursa Major [syn: Big Dipper, Dipper, Plough, Charles's Wain, Wain, Wagon]
noun
Elevated railway in an amusement park (usually with sharp curves and steep inclines) [syn: roller coaster, big dipper, chute-the-chute]

Synonyms of 'Big Dipper'

From: Moby Thesaurus