Disestablishmentarianism

[daviejones]

You know I'm right.

Nope...

[Charles Foster Kane]

Isn't there some chemical entity name that is longer?

pneumonoultramicroscopicsilicovolcanoconiosis is the longest, a lung disease.

[DimPrawn]

pneumonoultramicroscopicsilicovolcanoconiosis is the longest, a lung disease.

aka man flu.

HTH

[Bagpuss]

according to WonkyPedia that's a made up word

pseudopseudohypoparathyroidism isn't though

[NickFitz]

Isn't there some chemical entity name that is longer?

There's floccinoccinihilipilification, which is one letter longer than anitidisestablishmentarianism. Then there's that lung disease pneumonoultramicroscopicsilicovolcanoconiosis.

EDIT: Ah, somebody beat me to the pneumowotsit; not surprising, given how long it takes to type these words

[daviejones]

pneumonoultramicroscopicsilicovolcanoconiosis is the longest, a lung disease.

Lopado*te*macho*se*lacho*galeo*kranio*leipsano*dri mhypo*trimmato*silphio*parao*melito*katakechymeno* kichlepikossypho*phatto*peristeralektryonop*tekeph allio*kigklopeleiol*agoiosiraio*baphetraganop*tery gon

Or this!!!

[Charles Foster Kane]

according to WonkyPedia that's a made up word

pseudopseudohypoparathyroidism isn't though

pneumonoultramicroscopicsilicovolcanoconiosis is the longest. Wonky Pedia is a parody of Wikipedia, don't cite it as a source in any of your essays.

[Bagpuss]

There was a quiz show on BBC2 some years ago where you had to make a long word from 3 random letters where those letters apeared in order. One word would apear nearly every episode it contained so many letters of the alphabet, can't remember what it was??? grrr

[BrilloPad]

Wot about the thing Mary Poppins said?

[NickFitz]

pneumonoultramicroscopicsilicovolcanoconiosis is the longest. Wonky Pedia is a parody of Wikipedia, don't cite it as a source in any of your essays.

It's described by Wikipedia (link above) as a factitious word, in that it was a made-up word describing a non-existent condition, but it was later included in the dictionary (OED 1936 supplement) so, if one is just talking about "the longest word in the dictionary", it's a valid candidate.