what is the longest word and the definition of the word?

pneumonoultramicroscopicsilicovolcanoconiosis

- pretty sure it's a lung disease caused by volcanic ash. Believe it or not, I spelled this in 3rd grade :). My teacher was looking for the longest word in English to give me and I got it right! Still proud of that one ;)

EDIT: it isn't appearing in full on here for some reason.

The word with the most letters is a name of protein, as a name, it technically does not qualify as a word, but at 1913 characters, we just had to include it. Theoretically these names can contain an infinite amount of characters, but this one qualifies as it has actually been used in a medical journal.

methionylglutaminylarginyltyrosylglutamylserylleucyl phenylalanylalanylglutaminylleucyllysylglutamylarginyl lysylglutamylglycylalanylphenylalanylvalylprolylphenyl alanylvalylthreonylleucylglycylaspartylprolylglycylisol eucylglutamylglutaminylserylleucyllysylisoleucylaspartyl threonylleucylisoleucylglutamylalanylglycylalanylaspartyl alanylleucylglutamylleucylglycylisoleucylprolylphenyl alanylserylaspartylprolylleucylalanylaspartylglycylprolyl threonylisoleucylglutaminylasparaginylalanylthreonylleucyl arginylalanylphenylalanylalanylalanylglycylvalylthreonyl prolylalanylglutaminylcysteinylphenylalanylglutamyl methionylleucylalanylleucylisoleucylarginylglutaminyllysyl histidylprolylthreonylisoleucylprolylisoleucylglycylleucyl leucylmethionyltyrosylalanylasparaginylleucylvalylphenyl alanylasparaginyllysylglycylisoleucylaspartylglutamylphenyl alanyltyrosylalanylglutaminylcysteinylglutamyllysylvalyl glycylvalylaspartylserylvalylleucylvalylalanylaspartylvalyl prolylvalylglutaminylglutamylserylalanylprolylphenylalanyl arginylglutaminylalanylalanylleucylarginylhistidylasparaginyl valylalanylprolylisoleucylphenylalanylisoleucylcysteinyl prolylprolylaspartylalanylaspartylaspartylaspartylleucyl leucylarginylglutaminylisoleucylalanylseryltyrosylglycyl arginylglycyltyrosylthreonyltyrosylleucylleucylserylarginyl alanylglycylvalylthreonylglycylalanylglutamylasparaginyl arginylalanylalanylleucylprolylleucylasparaginylhistidyl leucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginyl alanylalanylprolylprolylleucylglutaminylglycylphenylalanyl glycylisoleucylserylalanylprolylaspartylglutaminylvalyllysyl alanylalanylisoleucylaspartylalanylglycylalanylalanylglycyl alanylisoleucylserylglycylserylalanylisoleucylvalyllysylisol eucylisoleucylglutamylglutaminylhistidylasparaginylisoleucyl glutamylprolylglutamyllysylmethionylleucylalanylalanylleucyl lysylvalylphenylalanylvalylglutaminylprolylmethionyllysyl alanylalanylthreonylarginylserine

The question 'what is the longest word in English' or 'what is the longest word in the world' is one that is not really answerable. The question always comes down to one of what exactly a 'word' is.

The words in the list below are of a few basic types: chemical names, jargon terms of a particular specialised field, or nonce words made up for the occasion, and a jocular one at that.

The words that are most often quoted as the longest are antidisestablishmentarianism, floccinaucinihilipilification and supercalifragilisticexpialidocious. The first of these is only 28 letters long, but has the distinction of being a word which actually referred to something in the real, every-day world, and it is formed along the usual lines of English word formation. A disestablishmentarian was one who favoured the disestablishment of the state church. One who was against it was, naturally, an antidisestablishmentarianism. It seems to have occured to no one that a possible adverb formed from this word would be antidisestablishmentarianistically (34 letters). In any case the plural of it would be 29 letters long, making it just as long as the next word.

Floccinaucinihilipilification (29 letters), is famous for being the longest word in the Oxford English Dictionary, however, this is now only true of the first edition, the second edition contains a few even-longer words. The word itself was a joke word of the 18th and 19th century literati, stemming from an Eton grammar school Latin drill.

Supercalifragilisticexpialidocious (34 letters) was made famous by the Walt Disney movie 'Mary Poppins' (1964), though it has been recorded earlier, going way back to the 1940s. Once again a joke word, it first appeared in comedy songs, of which the humour was supplied by the ridiculousness of the word. Nowadays it is used (also in a shortened version supercalifragilistic) to mean 'amazingly excellent', etc.

One sly answer to the question of what is the longest word would be DDT, for its full title is dichlorodiphenyltrichloroethane (31 letters). This is longer than antidis... and flocci... and is more likely to be considered a 'real' word than the slightly longer supercali... Also, three letters are easier to remember than 31. It is the longest in the Macquarie Dictionary.

Many of these long words were collected by Josefa Heifetz Byrne in her wonderful dictionary Mrs Byrne's Dictionary of Unusual, Obscure and Preposterous Words (1974).

The longest word to appear in standard English dictionaries is pneumonoultramicroscopicsilicovolcanokoniosis. This is the name of a lung disease suffered by miners. It first appeared in Webster's

Longest..note...ever...Her is going! Hippopotomonstrosesquippedaliophobia the terror of lengthy phrases. thus far as i'm able to determine, a scientist and a record. were given at the same time and suggested "we are gonna mess with those people." also: that's the interest that makes you concern lengthy phrases!

http://dictionary.reference.com/help/faq/language/...

Try checking out some of the longest words as documented by Dictionary.Com by following the above link.

Antidisestablishmentarianistically

Hippopotomonstrosesquippedalio phobia

Fear of long words

Add that to your paper and it will be a bit of a hit...

Pneumonoultramicroscopicsilicovolcanoconiosis

antidisestablishmentarianism- longest word that isn't a medical word

i think it's the one down there.

Pneumonoultramicroscopicsilicovolcanoconiosis.

woah.

it's like a lung disease.