(From corroboro, to strength-en,) all such medicines as are suited to strengthen the body, and therefore to restore the strength which has been lost. Dr. Cullen thinks, as a general term, it is improper; still as it is employed for medicines which increase the tone of the moving fibres, it may be allowable. Tonics and astringents are, however, the only medicines of this class; for though nutritious substances may be supposed to give strength, yet adding to the quantity of fluids without at the same time increasing the strength of the containing vessels, is a frequent cause of languor and debility. (See on this subject Conspectus Medicinae Theoreticae Doctoris Gregory de Remediis Roborantibus). Under this head are placed absorbents, agglutinants, and astringents. These give bulk and firmness to the solids, which are rendered necessary by the continual waste which the actions of life occasion. Absorbents remove redundant moisture, astringents contract the relaxed fibres, and agglutinants add substance, where a previous waste renders a supply necessary.