Jisho

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Noun
1. active ingredientPharmacology
Wikipedia definition
2. Active ingredientAn 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 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 which originally denoted a magical substance or drug.
Read “Active ingredient” on English Wikipedia
Read “有効成分” on Japanese Wikipedia
Read “Active ingredient” on DBpedia

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