A term used primarily in French Burgundy (clos = closed, clôture = enclosure) for a vineyard or site, but also for wineries that own such a site. As a rule, this is a reference to an enclosure with a wall, although this may no longer exist or may never have existed. In the Middle Ages, Clos was rather a general term for a vineyard. Many such vineyards were walled by the Cistercians in the Middle Ages to protect them from animals and the weather. The best-known walled vineyards include Clos de Vougeot (with a high, kilometre-long wall, some of which still exists today) and Clos des Lambrays in the Côte d'Or area.
In the past, you needed a wealth of encyclopaedias and specialist literature to keep up to date in your vinophile professional life. Today, Wine lexicon from wein.plus is one of my best helpers and can rightly be called the "bible of wine knowledge".
Prof. Dr. Walter Kutscher
Lehrgangsleiter Sommelierausbildung WIFI-Wien