D defs.my
Entry 2 senses Webster, 1913

Nightcap

· Night·cap · IPA /ˈnaɪtˌkæp/
01 n. A cap worn in bed to protect the head, or in undress.
  1. 1.
    A cap worn in bed to protect the head, or in undress.
  2. 2.
    An alcoholic beverage drunk at bedtime.[Cant]