The Collaborative International Dictionary of English v.0.48:

Bactericide \Bac*te"ri*cide\ (b[a^]k*t[=e]"r[i^]*s[imac]d), n.
   [Bacterium + L. caedere to kill] (Biol.)
   Same as Germicide.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bactericide
    n 1: any chemical agent that destroys bacteria [syn:
         bactericide, bacteriacide]
    2: any drug that destroys bacteria or inhibits their growth
       [syn: antibacterial, antibacterial drug, bactericide]