Definition of thimerosal
: a crystalline organic mercurial antiseptic C9H9HgNaO2S used especially for its antifungal and bacteriostatic properties
Origin and Etymology of thimerosal
probably from thi- + mercury + -o- + salicylate
First Known Use: 1949
Seen and Heard
What made you want to look up thimerosal? Please tell us where you read or heard it (including the quote, if possible).