The term "pure ground vanilla" refers to a type of vanilla extract that is made by grinding pure, unadulterated vanilla beans into a fine powder and then mixing it with an alcohol-based solution such as vodka or grain alcohol. This results in a highly concentrated flavor that can be used in baking, cooking, or even drinks. The term "pure" indicates that the vanilla extract is made from 100% natural ingredients with no added artificial flavors, colors, or preservatives.