The term that identifies a reaction that breaks apart macromolecules is hydrolysis.

Here's why:

* Hydrolysis means "breaking with water". In this process, a water molecule is added to a macromolecule, breaking the bond between monomers. This process is essential for breaking down large molecules into smaller, more usable units.

Let me know if you would like more details on hydrolysis or examples of how it works!