Extract

Extract refers to the soluble wort components that were extracted from the grains through the mashing process. It mainly contains sugars, complex carbohydrates and proteins, but also vitamins, trace elements. Brewers express the amount of extract in wort or beer as weight percent, degree Plato or specifc gravity units. See Understanding Attenuation for a more complete description of this subject.

You may also look at Malt extract.