Source : Webster's Revised Unabridged Dictionary (1913)

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}.

   2. (Railroad) A car used on freight or construction trains
      for brakemen, workmen, etc.; a tool car. [U. S.]

Source : WordNet®

caboose
     n 1: the area for food preparation on a ship [syn: {galley}, {ship's
          galley}, {cookhouse}]
     2: a car on a freight train for use of the train crew; usually
        the last car on the train [syn: {cabin car}]