GNU Collaborative International Dictionary of English

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Found one definition

1.       
   nightie n.
   1. Any loose-fitting clothing for wear in bed.
   
   [PJC]
   
   
   2. Especially: a loose dress designed to be worn in bed by women; a nightgown.
   
   Syn. -- nightgown, night-robe, nightdress.
   
   [WordNet 1.5]