From The Sunday Herald:
“Harry Potter has magicked his way into the English language: the word ‘muggle’ is to appear in the Oxford Dictionary.
Coined by author JK Rowling, the word was originally used in her bestselling Harry Potter series of books to mean a person who cannot practise magic. It has since passed into popular culture as a way of describing anyone who is clumsy or unable to master a skill, such as computing. “
An interesting article which mentions some of the history of fictional words in the OED. Unfortunately Toby McDonald’s research is attrocious! This paragraph:
“Last year the author won a high profile legal battle after US-based writer Nancy Stouffer, who wrote the Worst Witch series, claimed Rowling was a plagiarist who had stolen her material. Stouffer argued the word ‘muggle’, now credited to Rowling, was used by the student witches in her own fiction to the same effect.”