What is the longest word in the dictionary?

United States
April 6, 2007 11:41pm CST
and what does it mean?
1 response
@freak369 (4914)
• United States
7 Apr 07
pneumonoultramicroscopicsilicovolcanoconiosis 45 letters long Meaning: The disease that results from inhaling or coming into contact with silica dust.
1 person likes this
• United States
7 Apr 07
Well I will have to take your word for it, because it is not in the dictionary and spell check does not have it listed. I can almost say it except for the last part of it. Are you in the medical field? And do you know how old this word is, it must me fairly new?