Definition from Wiktionary, the free dictionary
Guinness (plural Guinnesses)
- (countable) A surname, an Anglicization of an Irish patronymic surname based on Angus.
- (uncountable) A brand of dark stout beer from Ireland, one of the most widely recognised brands of beer in the world, named for Arthur Guinness who first brewed it.
- (countable) A serving of the beverage.
- Three Guinnesses please, barman.