thiomersalPronunciation: /ˌθʌɪə(ʊ)ˈməːs(ə)l/Definition of thiomersal noun [mass noun] a compound able to inhibit the growth of bacteria and other microorganisms, used as a medical disinfectant and preservative for biological products. Chemical formula: C9H9O2SHgNa Origin: 1950s; from thio- + mer(cury) + sal(icylate)
