Etymology
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caboose (n.)

1747, "ship's cookhouse," from Middle Dutch kambuis "ship's galley," from Low German kabhuse "wooden cabin on ship's deck;" probably a compound whose elements correspond to English cabin and house (n.). Railroading sense "car for the use of the conductor, brakeman, etc.," is by 1859.

updated on September 19, 2017

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Definitions of caboose from WordNet

caboose (n.)
the area for food preparation on a ship;
Synonyms: galley / ship's galley / cookhouse
caboose (n.)
a car on a freight train for use of the train crew; usually the last car on the train;
Synonyms: cabin car
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.