1) Agent 
A class of antibiotics that prevents growth of bacterial cells.
A chemical agent that prevents bacteria from growing but doesn`t kill it
Any agent that inhibits or retards bacterial growth. ... Synonym: bacteriostatic agent. ... (05 Mar 2000) ... 
A chemical agent that prevents bacteria from growing but doesn
Doesn't necessarily mean that it kills bacteria. A stat means that it may simply be slowing growth or holding the death to growth rates of bacteria (same for fungal stats) more or less in equilibrium. Inhibits bacteria growth.
Type: Term Pronunciation: bak-tēr′ē-ō-stat Definitions: 1. Any agent that inhibits or retards bacterial multiplication. Synonyms: bacteriostatic agent
[n] - a chemical or biological material that inhibits bacterial growth
noun a chemical or biological material that inhibits bacterial growth
A substance that inhibits or retards bacterial growth.