wagon-lit

n., pl., wa·gons-lits, or wa·gon-lits (vä'gôN-lē').
A sleeping car on a European railroad train.

[French : wagon, railroad car (from EnglishWAGON) + lit, bed (from Old French , from Latin lēctus).]

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The noun has one meaning:

Meaning #1: a passenger car that has berths for sleeping
  Synonyms: sleeping car, sleeper

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