international unit
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international unit

Any of several precision standards used in measuring physical quantities, such as mass, length, and time (see International System of Units), and also lighting systems, radiation processes, and pharmacology. The luminous intensity or candlepower of a light is expressed in candelas. The second is based on the frequency of radiation emitted by cesium-133 atoms. In radioactive decay, the international unit is the number of disintegrations per second in a sample. In pharmacology, the international unit is the quantity of a substance (vitamin, hormone, or toxin) that produces a specified effect when tested according to an internationally accepted procedure.

international unit [¦in·tər¦nash·ən·əl ′yü·nət]

(biology)

A quantity of a vitamin, hormone, antibiotic, or other biological that produces a specific internationally accepted biological effect.

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international unit (redirected from I.U)

international unit

international unit
(redirected from I.U)