: a unit of mass equal to 1/1000 gram see Metric System Table

Examples of milligram in a Sentence

Recent Examples on the Web
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Key Takeaways Taking more than 40 milligrams of zinc daily for long periods can cause copper deficiency and damage the nervous system, causing irreversible issues like numbness, muscle weakness, and vision problems. Lindsay Curtis, Verywell Health, 11 Aug. 2026 The doctor prescribed 5 milligrams of the anxiety medication buspirone twice daily, as well as 25 milligrams of hydroxyzine – an antihistamine that would have similar effects to Benadryl – daily. Melina Khan, USA Today, 11 Aug. 2026 Hemp beverages would be taxed at a rate of 8 cents per milligram of THC. A.j. Herrington, Forbes.com, 10 Aug. 2026 Over six weeks, the group received three doses of oral psilocybin—first one milligram and then two 25-mg doses, each two weeks apart—alongside intensive talk therapy before and after dosing. Alexandra Pattillo, Scientific American, 5 Aug. 2026 See All Example Sentences for milligram

Word History

Etymology

French milligramme, from milli- + gramme gram

First Known Use

1797, in the meaning defined above

Time Traveler
The first known use of milligram was in 1797

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Cite this Entry

“Milligram.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/milligram. Accessed 17 Aug. 2026.

Kids Definition

milligram

noun
: a weight equal to ¹⁄₁₀₀₀ gram see metric system

Medical Definition

milligram

noun
mil·​li·​gram
variants or chiefly British milligramme
: one thousandth of a gram
abbreviation mg

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