• anonymous said on Nov 06, 2006....

  PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­CONIOSIS (also spelled PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­KONIOSIS) = a lung disease caused by breathing in particles of siliceous volcanic dust.
  
  This is the longest word in any English dictionary. However, it was coined by Everett Smith, the President of The National Puzzlers' League, in 1935 purely for the purpose of inventing a new "longest word". The Oxford English Dictionary described the word as factitious. Nevertheless it also appears in the Webster's, Random House, and Chambers dictionaries.

• kainaman said on Nov 06, 2006....

  antidisestablismentarianism = the belief which opposes removing the tie between church and state.
  Probably the most popular of the "longest words" in recent decades.

• mr_right14 said on Nov 06, 2006....

  ONE SEXMILLIAQUINGENTSEXAGINTILLION
   
  A Latin name for 6,560 used to denote  10^3(6560+1) or 10^19683.
  In British, it would be 10^6(6560) or 10^39360.
  This technical word was developed by John Horton Conway and Landon Curt Noll.
  For an open-ended system for naming powers of 10.
  Just like the word google.
  Google means 10^100.
  A six letter word but a value of more than a billion yet a calculator is not enough to display its value.
  You'll need a calculator with 100+1 digits display.
  Though its just a 1 with 100 zeros next to it.
   
   
  Krungthepmahanakornamornratanakosinmahintarayutthayamahadilokphopnopparatrajathan - iburiromudomrajaniwesmahasatharnamornphimarnavatarnsathitsakkattiyavisanukamprasit
  A place in Thailand which is commonly known as Bangkok, the capital of Thailand

• lioneljay said on Nov 06, 2006....

  Another word that is popular in discussions of long words is "hyperpolysyllabicsesquipedalianism," which means "the act of using words a foot and a half long to say very little." The things you learn in sixth grade, eh?
  

• capsaicin said on Nov 08, 2006....

  Two chemical terms (3,641 and 1,913 letters long) have appeared in the Guinness Book of World Records. They were withdrawn because they have never been used by chemists, and there is no theoretical limit to the length of possible legitimate chemical terms. A DNA molecule could have a name of over 1,000,000,000 letters if it was written out in full.
   

  (1,185) ACETYL­SERYL­TYROSYL­SERYL­ISO­LEUCYL­THREONYL­SERYL­PROLYL­SERYL­GLUTAMINYL­PHENYL­ALANYL­VALYL­PHENYL­ALANYL­LEUCYL­SERYL­SERYL­VALYL­TRYPTOPHYL­ALANYL­ASPARTYL­PROLYL­ISOLEUCYL­GLUTAMYL­LEUCYL­LEUCYL­ASPARAGINYL­VALYL­CYSTEINYL­THREONYL­SERYL­SERYL­LEUCYL­GLYCYL­ASPARAGINYL­GLUTAMINYL­PHENYL­ALANYL­GLUTAMINYL­THREONYL­GLUTAMINYL­GLUTAMINYL­ALANYL­ARGINYL­THREONYL­THREONYL­GLUTAMINYL­VALYL­GLUTAMINYL­GLUTAMINYL­PHENYL­ALANYL­SERYL­GLUTAMINYL­VALYL­TRYPTOPHYL­LYSYL­PROLYL­PHENYL­ALANYL­PROLYL­GLUTAMINYL­SERYL­THREONYL­VALYL­ARGINYL­PHENYL­ALANYL­PROLYL­GLYCYL­ASPARTYL­VALYL­TYROSYL­LYSYL­VALYL­TYROSYL­ARGINYL­TYROSYL­ASPARAGINYL­ALANYL­VALYL­LEUCYL­ASPARTYL­PROLYL­LEUCYL­ISOLEUCYL­THREONYL­ALANYL­LEUCYL­LEUCYL­GLYCYL­THREONYL­PHENYL­ALANYL­ASPARTYL­THREONYL­ARGINYL­ASPARAGINYL­ARGINYL­ISOLEUCYL­ISOLEUCYL­GLUTAMYL­VALYL­GLUTAMYL­ASPARAGINYL­GLUTAMINYL­GLUTAMINYL­SERYL­PROLYL­THREONYL­THREONYL­ALANYL­GLUTAMYL­THREONYL­LEUCYL­ASPARTYL­ALANYL­THREONYL­ARGINYL­ARGINYL­VALYL­ASPARTYL­ASPARTYL­ALANYL­THREONYL­VALYL­ALANYL­ISOLEUCYL­ARGINYL­SERYL­ALANYL­ASPARAGINYL­ISOLEUCYL­ASPARAGINYL­LEUCYL­VALYL­ASPARAGINYL­GLUTAMYL­LEUCYL­VALYL­ARGINYL­GLYCYL­THREONYL­GLYCYL­LEUCYL­TYROSYL­ASPARAGINYL­GLUTAMINYL­ASPARAGINYL­THREONYL­PHENYL­ALANYL­GLUTAMYL­SERYL­METHIONYL­SERYL­GLYCYL­LEUCYL­VALYL­TRYPTOPHYL­THREONYL­SERYL­ALANYL­PROLYL­ALANYL­SERINE = 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.

• glosta said on Nov 10, 2006....

  
  floccinaucinihilipilification means The estimation of something as worthless, but it is usually used as an example of a very long word.29 letters Thanks Wikipedia

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