form of the common beet having a sweet white root from which sugar is obtained

white-rooted beet grown as a source of sugar

A variety of beet (Beta vulgaris) which is specifically grown because of it's high sugar content which can be processed to produce quality sugars.

A type of beet with a very high sugar content that is cultivated primarily for making sugar. Most varieties of sugar beet are white inside and out and can be cooked and eaten as a vegetable, just like ordinary garden beets.

Sugar beet (Beta vulgaris L.), a member of the Chenopodiaceae subfamily and the Amaranthaceae family, is a plant whose root contains a high concentration of sucrose. It is grown commercially for sugar.