antimicrobial

Short definition from Wiktionary

Adjective

1. 1
   Tending to destroy or capable of destroying microbes.
2. 2
   Inhibiting the growth of microbes.
3. 3
   Preventing or counteracting the pathogenic action of microbes.

Noun

1. 1
   An agent (drug or other substance) that destroys microbes (i.e., kills off a population of them).
2. 2
   An agent (drug or other substance) that inhibits the growth of microbes but does not kill their whole population.
3. 3
   An agent (drug or other substance) that counteracts the pathogenic action of microbes.