Pneumonoultramicroscopicsilicovolcanoconiosis (-koniosis), a factitious word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust' but occurring chiefly as an instance of a very long word. 1936 F. Scully Bedside Manna 87 *Pneumonoultramicroscopicsilicovolcanakoniosis [sic], a disease caused by ultra-microscopic particles of sandy volcanic dust, might give even him laryngitis. 1966 Word Study Oct. 7/2 The resources of Greek have enriched the modern world as well as the ancient one. Perhaps this is most dramatically illustrated by the longest and most fantastic word now in an English dictionary (the Merriam-Webster's great Unabridged) which is forty-five letters in length: pneumonoultramicroscopicsilicovolcanoconiosis,..meaning 'a disease of the lungs caused by extremely small particles of ash and dust'. 1973 R. Megarry Second Miscellany-at-Law 160 It has been said that 'floccinaucinihilipilification' is the longest word in the English language... The word's proud title must yield to some technical terms, such as pneumonoultramicroscopicsilicovolcanokoniosis. The following appeared in a post in alt.usage.english: I conjecture that this "word" was coined by word puzzlers, who then worked assiduously to get it into the major unabridged dictionaries (perhaps with a wink from the editors?) to put an end to the endless squabbling about what is the longest word. [Note: To be precisely correct, pneumonoultramicroscopicsilicovolcanoconiosis is the longest vocabulary entry in any English-language dictionary. Stuart Kidd points out that a longer word actually appears in the OED2, although only as part of a quoted citation for a different word. It is a 75-letter chemical name with numerous hyphens, and it is described on page 13 of this web site. Several other citations in the OED2 include multiple words that are "run together" with or without hyphens, forming "words" of more than 45 letters.] Karl F. Lingenfelder reports that the domain name pneumonoultramicroscopicsilicovolcanoconiosis.com was registered on October 28, 1999, and that when activated it will point to http://www.mauigateway.com/~team/longestwordinenglish/ This is a commercial website selling domain names. The domain name Iamtheproudownerofthelongestlongestlongestdomainnameinthisworld.com may be the longest domain name. In 2005 the web page at this address states, "This record cannot be broken with a .com domain, because 63 letters is the maximum number of letters that can be registered as a domain name. Owner of the Longest Domain Name in this World : Dr. Subrahmanyam Karuturi"