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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.

See Examples For:

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

From Los Angeles Times Jun. 29, 2025

The decision for the panel to discuss thimerosal, a mercury-based preservative that has not been used in most vaccines for decades, is perplexing, Dr Hanage said.

From BBC Jun. 25, 2025

Thimerosal has been removed from childhood vaccines since 2001, according to the CDC, and “research does not show any link between thimerosal and autism.”

From Los Angeles Times Dec. 8, 2024

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

But a year or so later, Mr Kennedy wrote an article published in Rolling Stone magazine which repeated baseless claims that thimerosal was causing health problems.

From BBC Mar. 1, 2024

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