THE LONGEST ENGLISH WORD

The longest word to be found in a dictionary contains 45 letters:

pneumonoultramicroscopicsilicovolcanoconiosis

The meaning, according to the Oxford Dictionary, is:
"a lung disease caused by the inhalation of very fine silica dust, causing inflamation of the lungs"

Due to the rare use of the word outside the medical field, pronunciation aid resource is poor and only available through the following hyperlink:

http://www.thefreedictionary.com/Pneumonoultramicroscopicsilicovolcanoconiosis

If you are curious enough to find out what other words are also considered the longest in the English language, click on the following hyperlink:

http://en.wikipedia.org/wiki/Longest_word_in_English

Best wishes,
André