How Do You Spell Pneumonoultramicroscopicsilicovolcanoconiosis?

How Do You Spell Pneumonoultramicroscopicsilicovolcanoconiosis? Also spelt pneumonoultramicroscopicsilicovolcanokoniosis. What is pneumonoultramicroscopicsilicovolcanoconiosis? noun | A lung disease caused by the inhalation of very fine silicate or quartz dust, causing inflammation in the lungs. What word is 189 819 letters long? isoleucine. You’ll notice there’s an ellipsis here, and that’s because this word, in total, is 189,819