noun, Pharmacology.
an internationally agreed upon standard, as measured by bioassay, to which samples of a substance, as a drug or hormone, are compared to ascertain their relative potency.
the particular quantity of such a substance, which causes a specific biological effect.
Abbreviation: IU.

international unit n.
Abbr. IU

international unit
A unit for measuring a biologically active substance, such as a hormone or vitamin.


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