<P> Ron uses Parseltongue in the final book to reopen the Chamber of Secrets, but he is only imitating the sound of a phrase Harry used earlier in the book . </P> <P> Rowling borrowed the term from "an old word for someone who has a problem with the mouth, like a hare lip". </P> <P> Professor Francis Nolan, Professor of Phonetics at University of Cambridge, designed the version of Parseltongue used in the films as an ergative - absolutive language featuring geminate consonants and VSO word order . It has a high frequency of fricative and pharyngeal consonants to acoustically approximate the physiology of a snake . </P> <P> A Seer is a witch or wizard with the clairvoyant ability to predict future events . The predictions given through this ability can sometimes be self - fulfilling prophecies, and Dumbledore states in Order of the Phoenix that not all of them come true, depending on the choices made by those mentioned . This would seem to indicate that a Seer predicts possible or likely events, at least in some cases . </P>

Harry potter defence against the dark arts spells list