What is the longest word in the dictionary?



  1. 0 Votes

    The longest word in the Oxford dictionary is pneumonoultramicroscopicsilicovolcanoconiosis (44 letters).  It is the name of a lung disease.  

    The longest word not in the dictionary is a place in Whales with Welsh spelling: Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch. Here is a picture of the town’s sign:

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