a unit used to measure the activity of many vitamins, hormones, enzymes, and drugs. an international unit is the amount of a substance that has a certain biological effect. for each substance there is an international agreement on the biological effect that is expected for 1 international unit. also called iu.
出典:Wiktionary
出典:『Wiktionary』 (2025/07/29 03:46 UTC 版)
international unit (plural international units)