Today's word is clos. This is a french term that stands for enclosure. It refers to any vineyard or plot of land that is enclosed by a wall. It is commonly found in the region of Burgundy, but has also been used outside of that region. You'll see wineries, especially in the U.S. using Clos in their name, even though they don't have a wall.. For example: Clos du Val or Clos Pegase in California. In Burgundy, the most famous walled vineyard is Clos Vougeot. Here's a picture of their vineyards that I downloaded from their website. If you look very closely, you'll see the wall hug the roadside.
Similar in meaning is climat, also French. It refers to a single plot of land or field. Each climat is reported to have it's own terroir. What is terroir? Ahh, you'll have to wait until next Wednesday.