lan·dau 
(lăndô′, -dou′)
(lăndô′, -dou′)n.
1. A four-wheeled carriage with front and back passenger seats that face each other and a roof in two sections that can be lowered or detached.
2. A style of automobile with a similar roof.
adj.
Of or relating to a covering of fabric or vinyl over part or all of the roof of an automobile to make it resemble a convertible: a sedan with a landau top.
[After Landau, a city of southwest Germany.]
landau