What is a four-wheeled covered vehicle, the top of which is divided into two sections which can be let down, or thrown back, in such a manner as to make an open carriage. [Written also landaw.] called?

landau — A four-wheeled covered vehicle, the top of which is divided into two sections which can be let down, or thrown back, in such a manner as to make an open carriage. [Written also landaw.]. (Webster's 1913.)