Thibodaux (tĭbˈədō) [key], city (1990 pop. 14,035), seat of Lafourche parish, SE La., on Bayou Lafourche; inc. 1838. It is the commercial center of an oil, gas, sugarcane, and farm area in bayou country. Crawfish, alligators, shrimp, crabs, catfish, quail, and pheasants are raised or caught, and there is dairying. Manufactures include dairy products, raw sugar, tractors and loaders, sugarcane harvesters, marsh buggies, candy, and lumber. Among the many antebellum plantation houses in the area is the home (built 1790) of Chief Justice Edward Douglass White. Nicholls State Univ. is in Thibodaux. Annual Mardi Gras celebrations attract visitors.