What is the scientific name for trenches?

Answer 1

There is no scientific name for trenches generally.

There may be some biological or geological specific names but you will need to be more specific.

Answer 2

The scientific name for trenches is "hadal zone." This term refers to the oceanic trenches that are the deepest parts of the ocean, typically exceeding depths of 6,000 meters. Examples of hadal zones include the Mariana Trench and the Java Trench.