rat unit

noun

Medical Definition of rat unit

: a bioassay unit consisting of the amount of a material (as a vitamin) that under standardized conditions is just sufficient to produce a specified response in all or a designated proportion of a group of experimental rats

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“Rat unit.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/rat%20unit. Accessed 4 Dec. 2020.

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