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thimerosal

American  
[thahy-mur-uh-sal, -mer-] / θaɪˈmɜr əˌsæl, -ˈmɛr- /

noun

Pharmacology.
  1. a cream-colored, crystalline, water-soluble powder, C 9 H 9 HgNaO 2 S, used chiefly as an antiseptic.


thimerosal British  
/ θaɪˈmɛrəˌsæl /

noun

  1. a creamy white crystalline compound of mercury, used in solution as an antiseptic. Formula: C 9 H 9 HgNaO 2 S

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of thimerosal

1945–50; perhaps thi- + mer(cury) + -o- + sal(icylate)

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The new panel made its first decision last week, voting to stop recommending a small number of flu vaccines that still contain the preservative thimerosal, something Kennedy wrote a book about in 2015.

From BBC • Jun. 30, 2025

Autism rates, by the way, have continued to climb despite the thimerosal ban.

From Los Angeles Times • Jun. 29, 2025

On Thursday, the group is scheduled to hear a presentation on the use of thimerosal in vaccines given by Lyn Redwood, a former leader of Children's Health Defense, an anti-vaccine group Kennedy used to run.

From BBC • Jun. 25, 2025

No study ever established a link between thimerosal and autism.

From Los Angeles Times • Apr. 1, 2025

He questioned the safety of thimerosal, a common vaccine preservative, advancing the debunked claim it could lead to autism.

From Science Magazine • Nov. 26, 2024

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