'Nightcap' definitions:

Definition of 'nightcap'

From: WordNet
noun
An alcoholic drink taken at bedtime; often alcoholic
noun
A cloth cap worn in bed
noun
The final game of a double header

Definition of 'Nightcap'

From: GCIDE
  • Nightcap \Night"cap`\, n.
  • 1. A cap worn in bed to protect the head, or in undress. [1913 Webster]
  • 2. An alcoholic beverage drunk at bedtime. [Cant] --Wright. [1913 Webster]

Synonyms of 'nightcap'

From: Moby Thesaurus