international unit

noun

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

Examples of international unit in a Sentence

Recent Examples on the Web

Moreover, high-dose vitamin E supplements, which are defined as more than 400 international units (IU) per day, may be harmful.10 5. —Melissa Nieves, Verywell Health, 2 May 2025

To do so, squeeze the contents of a 1,000 international units (IU) liquid vitamin E capsule directly onto your tongue. —Anna Giorgi, Verywell Health, 26 Mar. 2025

Each day, most adults need about 600 international units (IU) of vitamin D, which can be found in sunlight and in certain foods, including mushrooms, fish, and dairy.9 Women need about 1.1 grams of omega-3 fatty acids daily, while men need about 1.6 grams. —Brian Mastroianni, Health, 12 Mar. 2025

Walgreens’ international unit, which operates more than 3,000 retail stores abroad, booked $6.43 billion in sales in the fiscal first quarter. —Annika Kim Constantino, CNBC, 10 Jan. 2025

Word History

First Known Use

1921, in the meaning defined above

Rhymes for international unit

• lunate
• multiunit
• subunit

Medical Definition

international unit

noun

: 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