Parseltongue is a magical language that is inherited genetically. It allows a mage to speak to serpents. Those who speak it are known as Parselmouths.
Harry Potter (c) belongs to J.K. Rowling and Warner Brother's Inc. This is a fanfiction and is not monetized, thus falling under Fair Use. All original additives to the copyrighted material belongs to E. J. Harville, alias Ukallii.