Here's why:

* Root hair cells are just a specific type of epidermal cell. They are specialized cells found in the root epidermis, the outermost layer of cells in the root.

* The scientific name for a root hair cell would simply be the name of the species of plant it belongs to, followed by "root hair cell". For example, "Zea mays root hair cell" would refer to a root hair cell from a corn plant.

So, while we don't have a unique scientific name, we can accurately describe them by referring to them as root hair cells, which are specialized cells found in the root epidermis.