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any substance capable of killing bacteria.
Historical Examples

The recent application of the action of bactericidal rays to the cure of lupus is, however, an extension of the same discovery.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 Various

To the bactericidal effect of sunlight is equally to be attributed the absence of bacteria from the High Alps.
Makers of British Botany; a collection of biographies by living botanists Various

It is generally known that radium, even if externally employed, has proved itself to be a bactericidal remedy.
The Propaganda for Reform in Proprietary Medicines, Vol. 1 of 2 Various

Bacterial growth is aided by the venom which blocks the bactericidal power of the blood.
Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) Ray D. Burkett

What is true of the bactericidal action of the salts of mercury is equally true of their therapeutic effect.
The Mechanism of Life Stphane Leduc

The bactericidal power of blood-serum from both alcohol-drinking and non-drinking persons was determined by some experiments.
Alcohol: A Dangerous and Unnecessary Medicine, How and Why Martha M. Allen

There is nothing in this product which possesses these bactericidal powers.
The Propaganda for Reform in Proprietary Medicines, Vol. 1 of 2 Various

The essential oil of the hop is bactericidal: hence the strong impregnation with hop juice of all beer intended for exportation.
Fragments of science, V. 1-2 John Tyndall

Antiseptic and bactericidal effects are easily estimated by laboratory methods.
The Propaganda for Reform in Proprietary Medicines, Vol. 2 of 2 Various

The serum of the susceptible rabbit, for example, is bactericidal to this organism, whilst the serum of the immune dog is not.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 Various

noun
a substance able to destroy bacteria