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Materia Medica, derived from two Latin words signifying medical material, the science which treats with medicine, their source or origin, their derivatives, physical and chemical properties, their method of preparation and administration, their dose, physiological and toxicological effects.

Therapeutics, derived from the Greek, Therapevo, meaning to serve or attend the sick, is that branch of knowledge which treats of the application of all means—medical or otherwise—to the cure of disease or relief of pain.

Toxicology, derived from the Greek Toxikon, a poison, is that branch of knowledge which treats of the nature, actions, detection and treatment of poisons.

A medicine is an agent of animal, vegetable, or mineral origin used for the cure of disease or relief of pain.

Drug, derived from the Dutch, Droog, meaning dry, is now used synonymously with medicine although originally referring to an herb or dried medical plant.