active ingredient

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Active Ingredient

Any component that provides pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or affects the structure or any function of the body of man or animals.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

ac·tive in·gre·di·ent

(ak'tiv in-grē'dē-ĕnt)
Any component of a pharmaceutical product that exerts pharmacologic activity.
Synonym(s): active pharmaceutical ingredient.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

active ingredient

the chemically active part of a manufactured product such as a HERBICIDE, the remainder being inert.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005