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The longest word in the English language according to Guinness is FLOCCINAUCINIHILIPILIFICATION. The lung disease one is the longest unnofficial word, cos it's a compound scientific term, and it's possible to make sceintific names stupidly long, like the 1700+ character one, but that's neverbeen in a dictionary. The longest word entered in a dictionary anywhere is Swedish, and it's NORDOSTERSJOKUSTARTILLERIFLYGSPANINGSSIMULATORANLAGG- NINGSMATERIELUNDERHALLSUPPFOLJNINGSSYSTEMDISKUSSIONS- INLAGGSFORBEREDELSEARBETEN, which means "preparatory work on the contribution to the discussion on the maintaining system of support of the material of the aviation survey simulator device within the north-east part of the coast artillery of the Baltic."
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