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From The Collaborative International Dictionary of English v.0.48:
germicidal \ger"mi*ci`dal\ (j[~e]r"m[i^]*s[imac]`dal), 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]