1. A concentrated form of a substance obtained by treating crude materials containing these substances with a solvent. 2. A preparation in which a solvent such as alcohol is used to separate out (to “extract”) certain chemicals from an herb, the product of which is called an herbal extract. 3. A pill, powder, liquid, or other form of an herb that contains a concentrated, and usually standard amount of therapeutic ingredients. The most commonly used extracts are fluid extracts, liquid extracts, solid extracts, powdered extracts, tinctures, and native extracts.