Other forms: nightgowns
A nightgown is a loose garment worn in bed by a woman. A long nightgown, a cotton nightgown, in her nightgown.
It is shortened to nightie in ordinary speech, and nightdress is the other British word. The word once covered a dressing gown as well, which is why old novels can be confusing about who is wearing what.
1nounnightgownA loose garment worn in bed by a woman.
“She came downstairs in her nightgown and slippers to make a cup of tea.”
nightgown is a garment.
Middle English nyght gowne is night plus gown.
Middle English
nyght gowne
English, today
nightgown
From Middle English nyght gowne. by surface analysis, en + night + gown.
Etymology from Wiktionary, CC BY-SA