Dictionary

international unit

international unit

noun

Definition of INTERNATIONAL UNIT

:  a quantity of a biologically active substance (as a vitamin) that produces a particular biological effect agreed upon as an international standard

First Known Use of INTERNATIONAL UNIT

1922

international unit

noun    (Medical Dictionary)

Medical Definition of INTERNATIONAL UNIT

:  the amount of specific physiological activity of a standardized preparation (as of a vitamin) that is agreed upon as an international standard especially for comparison with other biologicals containing the substance in impure form or with a related biologically active substance; also :  the amount of the biologically active substance in the standard amount of the preparation producing this activity

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