What is the longest word using each letter once?

What is the longest word using each letter once?

Uncopyrightable, with 15 letters and not a single one repeated.

Which is the longest word in dictionary?

pneumonoultramicroscopicsilicovolcanoconiosisThe longest word in any of the major English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis, a word that refers to a lung disease contracted from the inhalation of very fine silica particles, specifically from a volcano; medically, it is the same as silicosis.

What is the longest word in the world that takes 3 hours to say?

A man has been recorded spending more than three hours to pronounce what is supposedly the longest word in the English language. 'Methionylthreonylthreonylglutaminylarginyl isoleucine' is the chemical name of 'titin' (also known as 'connectin') – the largest known protein. It has 189,819 letters.