GNU Collaborative International Dictionary of English
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Found one definition
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germicidal (jẽrˈmĭ‑sīˌdal), a. [Germ + L. caedere to kill + -al.] (Biol.) Destructive to germs; -- applied to any agent which has a killing action upon living microorganisms, particularly bacteria or viruses, which are the cause of many infectious diseases.
Syn. -- antiseptic.
[1913 Webster +PJC]