interna'tional u'nit

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. Abbr.: IU

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

international temperature scaleInternational Workingmen's Association


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