Which is the longest word in English?

PNEUMONOULTRAMICROSCOPICSILICOVOLCANOCONIOSIS (45 letters; a lung disease caused by breathing in certain particles) is the longest word in any English-language dictionary.

Sorry I forgot about it. But I know two words that contains the most number of letters. It's POST OFFICE(just kidding).Can you please respond to my discussions with the username Dennik. They are interesting. Thank you in advance.

hmm u could list out a lot of chemical names as the ongest words .......if u say PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­CONIOSIS is the longest word:) so ........well

pneumonoultramicroscopicsilicovolcanoconiosis this has to b the second larget word. long back i read a word in newpaper article that contained 46 letters if i remem rite.it started wid 'f'. its a scientific term denoting some process.i cant remem that word if any 1 tells that word i will give him bast reply too

Praetertranssubstan tiationalistical ly has 37 letters.

Ecclesiazousae ("The Assemblywomen"), the ancient Greek comedic playwright Aristophanes created: Lopadotemachoselachogaleokranioleipsanodrimhypotrimmatosilphio-paraomelitokatakechymenokichlepikossyphophattoperisteralektryonop-tekephalliokigklopeleiolagoiosiraiobaphetraganopterygon, a word of 183 letters that describes a dish by stringing together its ingredients.

The two longest that I am aware of are: anti­disestablishmentarianism and supercalifragilisticexpialidocious.

Its pneumono­ultra­micro­scopic­silico­volcano­coniosis its a lung disease

see , if you want the word which is in your mind then it is hard to say , however if you wish to know the real answer , it is Pneumonoultramicroscopicsilicovolcanoconiosis , right!

its SMILES :-) as difference between two S's is 1 mile so its longest .. i guess, its best response

Longest word is "I" lolz... :D

I think it should be antidisestablishmentarianism