What is the longest English word containing no letter more than once?

There are two 15-letter words that meet this criterion: uncopyrightable, referring to something for which it is not possible to secure copyright, and dermatoglyphics, meaning 'the study of skin markings'.


See other Vocabulary Questions.
You may also be interested in: What is the longest one-syllable English word?
Or: What is the longest English word?

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources