Which ' Harry Potter' word is now in the Oxford English dictionary?

"Muggle" was added to the Oxford English Dictionary in 2003, where it is said to refer to a person who is lacking a skill.

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J. K. Rowling uses language in her books to enhance the other-worldliness of her theme. She not only references mythology through the inclusion of creatures such as centaurs and hippogriffs, but follows in the footsteps of such authors as Tolkien by creating a number of innovative new words for her world. Some of the words are transparent blends of existing words, for example:
‘Mudblood’ – meaning a witch or wizard who is born to non-magic parents – is a simple combination of two common English words. This is essentially a racial slur in the world of Hogwarts, as opposed to ‘pure-blood’ (with its uncomfortable echoes of Hitler’s Aryan ideal). The harsh plosive endings of the two syllables allow the word to be spat out with venom, making this immediately understood as an insult, before its meaning has been explained.
‘Animagus’ – a wizard who can transform into an animal – is a blend of animal and magus, a Persian priest or magician from antiquity, so the meaning of a wizard as an animal is clearly derived.

However, not all her inventions are so simple. For example, a ‘Horcrux’ – an object in which a dark wizard has concealed part of their soul – has no obvious origin. It has been suggested that ‘Horcrux’ is a blend of the Latin verb horrere, meaning ‘to shudder’, and the noun crux, meaning ‘destruction’, but I think it far more likely that Rowling was creating something unique and mysterious, without obvious meaning, in keeping with the dark, secretive connotations of the word. Certainly the most prolific of her creations is muggle – a non-magical person – which has now gained its own meaning outside of Harry Potter as ’a person who lacks a particular skill’, and is included in our dictionaries. For an invented word by an author to reach this status is a great achievement, and a clear indication of the impact of the language within her novels; readers have transferred the language from her world into our own.