thimerosal

noun

thi·​mer·​o·​sal thī-ˈmer-ə-ˌsal How to pronounce thimerosal (audio)
: a crystalline organic mercurial antiseptic C9H9HgNaO2S used especially for its antifungal and bacteriostatic properties

Examples of thimerosal in a Sentence

Recent Examples on the Web
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Studies have also disproven connections between autism and vaccines containing thimerosal, a preservative often used in combination vaccines, according to the U.S. Food & Drug Administration. Caroline C. Boyle, USA Today, 14 Apr. 2025 Many studies have found no evidence of harm of thimerosal in low doses in vaccines. Caitlin Owens, Axios, 13 Mar. 2025 In 2003, the AAP blasted one of their articles that claimed to find a link between thimerosal and autism. ArsTechnica, 26 Mar. 2025 While a Florida congressman, Weldon questioned the safety of the MMR vaccine and fought against using an ingredient called thimerosal in childhood vaccines. Will McDuffie, ABC News, 13 Mar. 2025 See All Example Sentences for thimerosal

Word History

Etymology

probably from thi- + mercury + -o- + salicylate

First Known Use

1949, in the meaning defined above

Time Traveler
The first known use of thimerosal was in 1949

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Cite this Entry

“Thimerosal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thimerosal. Accessed 29 Apr. 2025.

Medical Definition

thimerosal

noun
thi·​mer·​o·​sal thī-ˈmer-ə-ˌsal How to pronounce thimerosal (audio)
: a crystalline organic mercurial antiseptic C9H9HgNaO2S used especially for its antifungal and bacteriostatic properties see merthiolate

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