Guinness
From Longman Dictionary of Contemporary EnglishGuinnessGuin‧ness /ˈɡɪnəs/ trademark a type of stout (=a strong dark beer) which has a creamy white froth on top of it when it is poured into a glass. It is thought of as the national drink of Ireland and many people remember the phrase used in old advertisements, ‘Guinness is good for you’.