The word "strepto" when placed in front of a bacterium name indicates that the bacteria grow in chains.

Here's why:

* Strepto comes from the Greek word "strephein", meaning "to twist" or "to turn".

* It's used in biology to describe structures that are arranged in a chain-like manner.

* Streptococcus, for example, refers to bacteria that form spherical chains.

Therefore, if you encounter a bacteria name starting with "strepto", you can assume that it refers to bacteria that grow in chains.