There isn't a single scientific term for rocks that let water in. This is because the ability of a rock to let water in depends on several factors, including:

* Porosity: This refers to the amount of empty space within the rock. Rocks with high porosity have more spaces for water to occupy.

* Permeability: This describes how easily water can flow through the connected spaces in the rock.

* Fracturing: Cracks and fractures in a rock can also allow water to infiltrate.

So, instead of a single term, we use terms that describe these properties:

* Permeable rocks: These rocks allow water to flow through them easily, such as sandstone or limestone.

* Porous rocks: These rocks have many spaces for water to be held, but they may not necessarily be permeable, like some volcanic rocks.

* Fractured rocks: These rocks have cracks that allow water to enter, even if the rock itself is not porous or permeable.

It's also important to note that the amount of water a rock can hold can also vary depending on factors like the size of the spaces and the type of water present.