active principle
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n.
A constituent of a drug, usually an alkaloid or glycoside, on which the characteristic therapeutic action of the substance largely depends.
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Which of the following nouns has an irregular plural form?
Words nearby active principle
active margin, active mass, active-matrix, active methyl, active optics, active principle, active reason, active repressor, active safety, active service, active shooter
The American Heritage® Stedman's Medical Dictionary
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