An agent that slows or stops the growth of bacteria is called a bacteriostatic agent.

Here's a breakdown:

* Bacteriostatic: This term describes something that inhibits the growth of bacteria, but doesn't necessarily kill them.

* Bactericidal: This term describes something that kills bacteria.

Examples of bacteriostatic agents:

* Antibiotics: Many antibiotics, such as tetracycline and sulfonamides, are bacteriostatic.

* Preservatives: Some preservatives in food and cosmetics are bacteriostatic, preventing bacteria from spoiling the product.

* Disinfectants: Some disinfectants, used for cleaning surfaces, can be bacteriostatic, preventing the spread of bacteria.

Note: It's important to understand that bacteriostatic agents can be effective in controlling bacterial growth, but they don't always eliminate bacteria completely.