There isn't a specific scientific name for "stratus rain clouds" because stratus clouds themselves can produce rain.

Here's why:

* Stratus: These are low-level clouds that appear as a uniform, gray sheet. They can produce light rain or drizzle.

* Nimbostratus: These are darker, thicker stratus clouds that are associated with more significant rainfall. However, they are still considered a type of stratus cloud.

So, while nimbostratus clouds are known for heavier rain, both stratus and nimbostratus clouds are capable of producing precipitation.