cortana what's the longest word.
The longest word in the Oxford English Dictionary is 'pneumonoultramicroscopicsilicovolcanoconiosis' at 45 letters long. 'Supercalifragilisticexpialidocious', made famous by Mary Poppins, is 34 letters long. > 'Amazeballs', 'mummy porn', 'frenemy' make Collins online dictionary.