The LONGEST word in the world has 1,185 letters!
*** I had to hyphens in it, so Y! Answers would allow you to see the whole thing. ***
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(Definition: Tobacco Mosaic Virus, Dahlemense Strain.
This word has appeared in the American Chemical Society's Chemical Abstracts and is thus considered by some to be the longest real word.)
The longest word in English: honorificabilitudinitatibus
It means: "the state of being able to achieve honors"
In Finnish: solutomaattimittaamotulos
It means: "the result from a measurement laboratory for tomatoes”
There are some other entries, but some were "created" just to try to make the claim of "longest word", such as the case of these words:
(Definition: a lung disease caused by breathing in particles of siliceous volcanic dust. It was created in 1935.)
(Definition: a surgical creation of a connection between the gall bladder and a hepatic duct and between the intestine and the gall bladder.)
(Definition: pertaining to a very long word.)