| n. | 1. | A cap worn in bed to protect the head, or in undress. |
| 2. | An alcoholic beverage drunk at bedtime. |
| Noun | 1. | nightcap - an alcoholic drink taken at bedtime; often alcoholic |
| 2. | nightcap - a cloth cap worn in bed | |
| 3. | nightcap - the final game of a double header |