(informal) A woman's nightgown or nightdress for wearing to bed.

Alternative form of nighty (“good night”)

a small, dim light or lamp left on overnight / light that shines at night such as moonlight, starlight, etc.

Happening or appearing in the night; night-time; nocturnal. / Performing, occurring, or taking place every night. / Used in the night.

Every night.

(computing) A build of a software program with the latest changes, released every night.

(now rare) A demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep.

To have a nightmare.

Something that lasts throughout the whole night. / (UK, crime, slang) A session with a prostitute covering the entire night.

The plant Atropa belladonna, a perennial shrub of the nightshade family that contains high concentrations of the alkaloid atropine which can be deadly if taken in excess.