O
- Oenophile
- A wine aficionado or connoisseur.
- Oenology
- The study of aspects of wine and winemaking.
- Old World wine
- Wines produced inside of the traditional wine growing areas of Europe and North Africa.
- Organoleptic
- A winetasting term for anything that affects one of the main senses such as smell. An example would be an affliction of the common cold or being in a room with someone wearing an overwhelming amount of perfume.
Read more about this topic: Glossary Of Wine Terms