• synonyms


[thahy-mur-uh-sal, -mer-]
noun Pharmacology.
  1. a cream-colored, crystalline, water-soluble powder, C9H9HgNaO2S, used chiefly as an antiseptic.
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Origin of thimerosal

1945–50; perhaps thi- + mer(cury) + -o- + sal(icylate)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for thimerosal


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

C20: from thio- + mer (cury) + sal (icylate)
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

thimerosal in Medicine


  1. A mercury-based crystalline powder with antibacterial and antifungal properties, used as a local antiseptic and preservative in vaccines and other drugs.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.