What does "nightgown" mean?

A long loose robe worn mainly by women for sleeping in.

What is a synonym for "nightgown"?

Common synonyms include: nightdress, nightie, bedgown, gown, house gown, negligee.

Pronounced //ˈnaɪtˌɡaʊn//.

/ˈnaɪtˌɡaʊn/ noun

noun ·Rare ·Advanced level

Noun

1
A long loose robe worn mainly by women for sleeping in.
2
lingerie consisting of a loose dress designed to be worn in bed by women wordnet
3
A dressing gown.

"Mary was still wearing a nightgown when Tom got to her house at noon."

From Middle English nyght gowne. By surface analysis, night + gown.