'Nightgown' definitions:

Definition of 'nightgown'

(from WordNet)
noun
Lingerie consisting of a loose dress designed to be worn in bed by women [syn: nightgown, gown, nightie, night- robe, nightdress]

Definition of 'Nightgown'

From: GCIDE
  • Nightgown \Night"gown`\, n. A loose gown used for undress; also, a gown used for a sleeping garment. [1913 Webster]

Definition of 'nightgown'

From: GCIDE
  • nightclothes \nightclothes\ n. garments designed to be worn in bed, such as pyjamas, a nightgown, etc.
  • Syn: nightwear. [WordNet 1.5]