Definition from Wiktionary, the free dictionary
See also détroit
From French détroit (“strait”) in Rivière du Détroit (Detroit River)
Proper noun 
- The largest city and former capital of Michigan, a major port on the Detroit River, known as the traditional automotive center of the U.S.
- (by mentonymy) The United States automotive industry.
- (city of Michigan): 3-1-3 (slang), Arsenal of Democracy (dated), D (colloquial), D-Town (informal), Hockeytown (informal), Motor City, Motown (informal), Rock City (informal)
largest city and former capital of Michigan