pneumonoultramicroscopicsilicovolcanoconiosis
Noun
Meaning
pneumonoultramicroscopicsilicovolcanoconiosis (uncountable)
(nonce word) A disease of the lungs, allegedly caused by inhaling microscopic silicate particles originating from the eruption of a volcano.
Examples
Ones like pneumonoultramicroscopicsilicovolcanoconiosis, of course.
The longest word in English is pneumonoultramicroscopicsilicovolcanoconiosis, a medical term. It's 45 letters long.