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Definition of Active ingredient

Babylon English

ingredient which is responsible for the action of a product (cleaning action, therapeutic action of medication, etc.)
Active ingredient Definition from Science & Technology Dictionaries & Glossaries
Biological Control
The component of a pesticide formulation responsible for the toxic effect.
Catherine R. Weeden
Active ingredient Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
An active ingredient (AI) is the substance in a pharmaceutical drug or a pesticide that is biologically active. The similar terms active pharmaceutical ingredient (API) and bulk active are also used in medicine, and the term active substance may be used for pesticide formulations. Some medications and pesticide products may contain more than one active ingredient. The traditional word for the API is pharmacon or pharmakon (from Greek: (φάρμακον), adapted from pharmacos) which originally denoted a magical substance or drug.

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Active ingredient Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
In any pesticide product, the component that kills, or otherwise controls, target pests. Pesticides are regulated primarily on the basis of active ingredients.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
In any pesticide product, the component that kills, or otherwise controls, target pests. Pesticides are regulated primarily on the basis of active ingredients.
Active ingredient Definition from Medicine Dictionaries & Glossaries
A Dictionary of Alternative-Medicine Methods
A product component responsible for an effect the product was designed to have.
The Glossary of the American Council on Science and Health
A product component responsible for an effect the product was designed to have.
Drugs@FDA Glossary
An active ingredient is any component that provides pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body of man or animals.
  
Source: U.S. Food and Drug Administration, Center for Drug Evaluation and Research. (About)