GNU Collaborative International Dictionary of English

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  1.       
    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]