thimerosal
noun
thi·mer·o·sal
thī-ˈmer-ə-ˌsal 
: 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
Why and where is thimerosal used?
—
Gabrielle Emanuel, NPR, 30 Jan. 2026
John Gilmore, founder and executive director of the Autism Action Network, advocate for legislation to ban use of thimerosal in vaccines in New York, and a parent of an autistic child.
—O. Rose Broderick, STAT, 28 Jan. 2026
In June, the panel endorsed thimerosal-free vaccines, although there’s no evidence of harm from the vaccine preservative.
—Jamie Gumbrecht, CNN Money, 3 Dec. 2025
Notably, the word thimerosal does not appear in this week’s update from the CDC.
—Benjamin Mazer, The Atlantic, 21 Nov. 2025
See All Example Sentences for thimerosal
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Gabrielle Emanuel, NPR, 30 Jan. 2026
John Gilmore, founder and executive director of the Autism Action Network, advocate for legislation to ban use of thimerosal in vaccines in New York, and a parent of an autistic child.
—O. Rose Broderick, STAT, 28 Jan. 2026
In June, the panel endorsed thimerosal-free vaccines, although there’s no evidence of harm from the vaccine preservative.
—Jamie Gumbrecht, CNN Money, 3 Dec. 2025
Notably, the word thimerosal does not appear in this week’s update from the CDC.
—Benjamin Mazer, The Atlantic, 21 Nov. 2025
See All Example Sentences for thimerosal
Cite this Entry
“Thimerosal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thimerosal. Accessed 15 Feb. 2026.
Copy CitationMedical Definition
thimerosal
noun
thi·mer·o·sal
thī-ˈmer-ə-ˌsal
: a crystalline organic mercurial antiseptic C9H9HgNaO2S used especially for its antifungal and bacteriostatic properties see merthiolate
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