Hypertext Webster Gateway: "nightcap"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Nightcap \Night"cap`\, n.
1. A cap worn in bed to protect the head, or in undress.
2. A potion of spirit drank at bedtime. [Cant] --Wright.
From WordNet (r) 1.7 (wn)
nightcap
n 1: an alcoholic drink taken at bedtime; often alcoholic
2: a cloth cap worn in bed
3: the final game of a double header
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