O'Darby Irish cream liqueur with a chocolate base.

Oenologist Specialist in the study of wine.

Oenology The scientific study of wine.

Oenometer Instrument for measuring amount of alcohol in wine.

Off-Licence A special licence issued to a shop to permit the sale of alcoholic beverages.

O'Jaffa Israeli orange liqueur.

Okolehao Spirit made in Hawaii from the roots of the ti plant, molasses and rice lees. Also known as oke.

On Tap Beer served by draft rather than by bottle.

On the House Term used to describe free drinks provided by a publican.

On the Rocks American term describing an alcoholic drink served with ice.

On the Wagon Someone who has stopped using alcohol.

Optic Device for measuring amounts of spirits served in a public house, etc.

Orange Liqueurs Spirit-based orange liqueurs such as Grand Marnier and Cointreau.

Order of Good Templars First international temperance organisation started in 1851 in Utica, New York.

Ordinaire French alcoholic beverage with no stated origin.

Organic Disorder Impaired function due to known pathological condition.

Original Norfolk Punch Non-alcoholic drink made from a variety of herbs and spices.

Orujo Inexpensive Spanish brandy.

Ouzo Clear aniseed-flavoured Greek liqueur with aromatic herbs.

Oxymel Drink made from vinegar and honey. Also known as honegar.