Proper noun
parseltongue
A fictional language of snakes in the Harry Potter universe.
Chamber of Secrets, Chapter 17 In his second year at Hogwarts, Harry uses Parseltongue to open the chamber and destroys the diary containing the embodied memory of a 16-year-old Tom Riddle from his own days at Hogwarts. Source: Internet
Dumbledore is known to be able to understand Mermish and Gobbledegook (Goblin language) and Parseltongue. Source: Internet
Ron opens the door (despite not speaking Parseltongue) by imitating sounds he heard Harry use to open Slytherin's locket. Source: Internet
The Gaunt family speak Parseltongue among themselves. Source: Internet