pneumonoultramicroscopicsilicovolcanoconiosis

The longest word in the dictionary that can mean a certain lung disease caused by inhaling fine silica dust from volcanoes, or it can be used as a fun word to say because its so incredibly long. WARNING. THIS WORD IS LONGER THAN SUPERCALIFRAGILISTICEXPIALIDOCIOUS BY A FEW SYLLABLES. Hope you don't have Hippopotomonstrosesquippedaliophobia.

Me: "Did you ever hear the longest word ever? "
Person Who Hasn't Read This Yet: "Yes, I think its Supercalifragilisticexpialidocious."
"Well you're WRONG, its Pneumonoultramicroscopicsilicovolcanoconiosis. HAH.