Etymology
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nightgown (n.)

also night-gown, "loose gown for putting on at night," c. 1400, from night + gown.

updated on June 13, 2019

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Definitions of nightgown from WordNet

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