Source : Webster's Revised Unabridged Dictionary (1913)

Landau \Lan"dau\, n. [From the town Ladau in Germany; cf. F.
   landau. See {Land}, {Island}.]
   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}.]

Source : WordNet®

Landau
     n 1: Soviet physicist who worked on low temperature physics
          (1908-1968) [syn: {Lev Davidovich Landau}]
     2: a four-wheel covered carriage with a roof divided into two
        parts (front and back) that can be let down separately