Wassail
1. A salutation used when presenting a cup of wine to a guest, or drinking the health of a person (to which the correct reply is “drink-hail”) and thus by extension any general salutation.
2. The liquor in which healths were drunk and particularly the spiced ale used in Twelfth Night and Christmas Eve celebrations.
  
3. A custom observed on Twelfth Night and New Year’s Eve of drinking healths from the wassail-bowl and hence a carousal or riotous festivity.
4. A carol or drinking song sung by wassailers.
5. To drink to the health of fruit-trees, cattle etc. in wassail, in order to ensure their thriving — hence the tradition of wassailing apple trees.