Etymology
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nightie (n.)

1871, short for nightgown; originally a children's word.

updated on July 25, 2012

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Definitions of nightie from WordNet

nightie (n.)
lingerie consisting of a loose dress designed to be worn in bed by women;
Synonyms: nightgown / gown / night-robe / nightdress
From wordnet.princeton.edu, not affiliated with etymonline.