Bizarre English language facts #2

Have you ever wondered what is the longest English word existing? This word has 45 alphabets, it refers to a lung disease. Are you ready to see this word? 

Pneumonoultramicroscopicsilicovolcanoconiosis

If you do not know this word in the first place, you would have thought a cat stepped on the keyboard!

PS: Don't worry, we won't ask you to spell it :)