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international unit

 
–noun Pharmacology.
1. 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.
2. the particular quantity of such a substance, which causes a specific biological effect. Abbreviation: IU
Origin:
1920–25
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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international unit  
n.   Abbr. IU
  1. The quantity of a biologically active substance, such as a hormone or vitamin, required to produce a specific response.
  2. A unit of potency for similarly active substances, based on this quantity and accepted as an international standard.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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international unit  
A unit for measuring a biologically active substance, such as a hormone or vitamin.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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