Longest Word

The longest word in the Oxford Dictionary of English is pneumonoultramicroscopicsilicovolcanoconiosis - at 45 letters. Its definition is "an artificial long word said to mean a lung disease casued by inhaling very fine ash and sand dust.

The longest word to be found in Britain is the Welsh place name Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch. 

At 80 letters, the longest word ever composed in German is Donaudampfschifffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft, the "Association for Subordinate Officials of the Head Office Management of the Danube Steamboat Electrical Services".