Large group of mostly organic hydrocarbon, but partly also oxygen compounds, which are the main constituent of essential oils. This colorless flavorings also come in the form of aldehydes, ketones and alcohols in numerous oils, balms and vegetable resinate in front. Terpene derivatives are for example camphor, citral, linalool, Menthol, nerol (Geraniol), pinene and phytol. Also the carotenoids (large group of dyes found in animal and plant kingdoms) are among the terpenes. Terpenes are present as flavanoids in the grapes in free form, and are also formed during the winemaking in bound form. They give the grapes or the wine a characteristic and easily recognizable Aroma (Primary flavor). Particularly pronounced with 1 to 4 mg / l share they come Muskateller- and Traminer varieties (especially Gewurztraminer ). Terpenes are also in the Oak wood particularly of American origin. The typical smell is at one wine address often as balmy. flowery ( roses ) or spicy designated.