The Collaborative International Dictionary of English v.0.48:

Caboose \Ca*boose"\ (k[.a]*b[=oo]s"), n. [Cf. D. kabuis,
   kombuis, Dan. kabys, Sw. kabysa, G. kabuse a little room or
   hut. The First part of the word seems to be allied to W. cab
   cabin, booth. Cf. Cabin.] [Written also camboose.]
   1. (Naut.) A house on deck, where the cooking is done; --
      commonly called the galley.
      [1913 Webster]

   2. (Railroad) A car used on freight or construction trains as
      travelling quarters for brakemen, workmen, etc.; a tool
      car. It usually is the last car of the train. [U. S.]
      [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Camboose \Cam*boose"\, n. (Naut.)
   See Caboose.
   [1913 Webster]